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IAI CCSI practice questions

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Question 1Crime Scene Investigation

At a crime scene, which action best describes the primary purpose of establishing a secured perimeter before evidence documentation begins?

  1. Ensuring all responding officers can freely walk through to locate witnesses
  2. Allowing media representatives to record the scene from a controlled distance
  3. Permitting the first officer to relocate items to a staging area for convenience
  4. Preserving the scene's integrity by limiting access and preventing contamination or loss of evidence Correct answer.

Explanation

The perimeter exists to protect the scene from contamination, alteration, and unauthorized entry. Controlling access preserves the evidentiary value of the scene until documentation and collection are complete. Relocation or open access undermines later reconstruction and admissibility.

Question 2Crime Scene Investigation

A crime scene investigator is documenting a scene where a suspect allegedly forced entry through a window. Which documentation approach best captures the scene before alteration?

  1. Waiting until the scene is processed by the laboratory before any documentation
  2. Photographing and sketching the scene as found before any items are moved or collected Correct answer.
  3. Collecting the broken glass first, then photographing the emptied frame
  4. Asking the homeowner to clean the area so later photographs are clearer

Explanation

Documentation must precede collection and alteration so the original condition is preserved in the record. Photographs and sketches taken as found support reconstruction and corroborate later testimony. Collecting or cleaning first destroys the contextual relationships investigators need.

Question 3Crime Scene Investigation

Which chain-of-custody practice most reliably preserves the integrity of a collected item from the scene to the laboratory?

  1. Allowing any officer to remove the item from the property room without documentation
  2. Relying on the collector's memory of when the item was found
  3. Storing the item in an unsealed bag so it can be examined without delay
  4. Recording each transfer of the item with date, time, and the signatures of the releasing and receiving persons Correct answer.

Explanation

A defensible chain of custody continuously documents possession, so any gap or unauthorized handling can be identified. Each transfer should be logged with time, date, and signatures. Unrecorded or unsealed handling creates doubt about integrity and possible tampering.

Question 4Crime Scene Investigation

When photographing a bloodstain pattern on a vertical wall, which technique best supports later scale and orientation analysis?

  1. Relying solely on a written description of the pattern
  2. Photographing the wall without any scale or orientation reference
  3. Using only a single wide-angle image of the entire room
  4. Including a scale and a level or reference marker in an overall and close-up series Correct answer.

Explanation

Bloodstain documentation requires both overall and close-up images with a scale, plus orientation references, so the pattern can be measured and related to the scene. Without scale or orientation, analysis of directionality and size is unreliable. A single wide shot cannot capture detail.

Question 5Crime Scene Investigation

An investigator finds a firearm at a scene. Which handling practice best minimizes the risk of destroying latent prints and trace evidence?

  1. Lifting the weapon by the textured grip area after photographing it in place Correct answer.
  2. Handling the weapon with bare hands to feel whether it is loaded
  3. Picking up the weapon by the trigger guard and waving it to check for rounds
  4. Inserting a pen into the barrel to lift and move the weapon

Explanation

Firearms should be photographed in place and then handled minimally, avoiding areas likely to hold latent prints and trace evidence. The textured grip and barrel are common print surfaces. Bare-hand handling transfers prints and contaminates the evidence.

Question 6Crime Scene Investigation

Which statement best explains why a crime scene sketch should include measurements from fixed reference points rather than relative descriptions alone?

  1. Fixed reference measurements allow the scene to be reconstructed accurately and defend positions in court Correct answer.
  2. Measurements are optional and serve only as decorative additions to the report
  3. Fixed references are only needed when photographs are unavailable
  4. Relative descriptions are preferred because measurements are rarely admissible

Explanation

Sketches with measurements tied to fixed reference points allow accurate reconstruction of spatial relationships. This supports testimony and lets others verify positions. Relative or descriptive-only sketches cannot be reliably reproduced.

Question 7Crime Scene Investigation

During scene processing, a footwear impression is found in damp soil. Which immediate action best preserves its detail for later comparison?

  1. Covering it with a heavy board and walking over it to test depth
  2. Photographing it with a scale and casting it before the soil dries or is disturbed Correct answer.
  3. Ignoring it because soil impressions are rarely useful
  4. Immediately digging it out and placing the loose soil in a bag

Explanation

Damp-soil impressions can deteriorate rapidly, so they should be photographed with a scale and cast while the medium still holds detail. Casting preserves three-dimensional characteristics for comparison. Digging or trampling destroys the impression.

Question 8Crime Scene Investigation

Which principle best explains why investigators should change gloves and use clean instruments between collecting separate items at a scene?

  1. To satisfy a requirement that gloves be discarded after each photograph
  2. To speed up the collection process by reducing paperwork
  3. To prevent cross-contamination that could transfer DNA or trace material between items Correct answer.
  4. To keep the investigator's hands warm during outdoor processing

Explanation

Cross-contamination occurs when material from one item is transferred to another, potentially creating false associations. Changing gloves and cleaning tools between items reduces this risk. This is fundamental to preserving the evidentiary value of biological and trace evidence.

Question 9Crime Scene Investigation

A scene contains a suspected accelerant pour pattern on a floor. Which collection approach best supports laboratory analysis?

  1. Collecting the sample in a porous paper bag left open to the air
  2. Collecting a sample from a distant room as a control only
  3. Spraying the area with water before collection to suppress odor
  4. Collecting debris from the pour area in an airtight, clean metal or glass container Correct answer.

Explanation

Ignitable liquid residues are volatile, so they must be sealed in airtight, clean containers to prevent loss and contamination. Comparison samples from unaffected areas are also useful. Paper bags and water would allow evaporation or dilution of the residue.

Question 10Crime Scene Investigation

Which statement best describes the role of a crime scene log at the entry point of a secured scene?

  1. It replaces the need for chain-of-custody documentation
  2. It records only the names of officers who collected evidence
  3. It records who entered, when, and why, creating a documented account of scene access Correct answer.
  4. It serves as a guest register for media and bystanders

Explanation

A scene log documents all persons entering and leaving the scene, including time and purpose. This supports scene integrity and helps identify potential contamination sources. It does not replace item-level chain-of-custody records.

Question 11Crime Scene Investigation

A victim's clothing is to be collected for trace evidence. Which practice best preserves the evidence?

  1. Washing the clothing before packaging to remove contaminants
  2. Sealing damp clothing in plastic to retain moisture
  3. Shaking the clothing outdoors to remove loose debris
  4. Air-drying if damp and packaging each garment separately in paper Correct answer.

Explanation

Damp clothing should be air-dried to prevent mold and degradation, then packaged separately in breathable paper to avoid cross-transfer. Sealing damp items in plastic promotes deterioration. Shaking or washing destroys trace evidence.

Question 12Crime Scene Investigation

Which factor most directly determines whether a scene should be treated as a major crime scene requiring full forensic processing?

  1. The nature and seriousness of the alleged offense and the potential evidentiary value of the scene Correct answer.
  2. The number of officers currently on duty at the station
  3. The personal preference of the first responding officer
  4. The availability of a photographer on the day of the incident

Explanation

Scene processing decisions are driven by the seriousness of the offense and the likelihood that the scene holds evidence relevant to the investigation. Resource availability may affect logistics but should not determine whether evidence is preserved. Decisions should follow policy and evidentiary need.

Question 13Crime Scene Investigation

Which statement correctly describes the difference between a rough sketch and a finished sketch in crime scene documentation?

  1. The rough sketch is made at the scene, while the finished sketch is a refined, scaled rendering prepared later for the record Correct answer.
  2. Both are prepared only after evidence collection is complete
  3. The finished sketch is optional and has no evidentiary role
  4. The rough sketch is prepared in court, while the finished sketch is made at the scene

Explanation

The rough sketch captures measurements and layout at the scene, often not to scale. The finished sketch is later refined, often to scale, and serves as the formal record. Both contribute to documentation and reconstruction.

Question 14Crime Scene Investigation

An investigator observes a possible bite mark on a victim. Which approach best reflects accepted forensic practice?

  1. Measure the mark and compare it to a suspect's dental records without expert involvement
  2. Cast the injury with dental stone at the scene
  3. Document the injury photographically with scale and consult a qualified forensic odontologist for interpretation Correct answer.
  4. Immediately swab the area and declare it a bite mark without expert review

Explanation

Bite mark evidence is complex and should be documented with scaled photography and evaluated by a qualified forensic odontologist. Interpretation by untrained personnel risks error. Casting or comparing without expertise can mislead the investigation.

Question 15Crime Scene Investigation

Which practice best supports the collection of DNA evidence from a doorknob suspected of being touched by a suspect?

  1. Wiping the doorknob with a wet cloth and squeezing the cloth into a tube
  2. Collecting the entire doorknob without documentation
  3. Swabbing the surface after applying a visible dye stain to locate prints
  4. Swabbing the surface with a sterile swab moistened as appropriate and air-drying before packaging Correct answer.

Explanation

Touch DNA is collected by swabbing with sterile, appropriately moistened swabs and air-drying before packaging to prevent degradation. Proper technique maximizes recovery and preserves sample integrity. Applying dyes or wiping with cloths can interfere with or dilute DNA.

Question 16Crime Scene Investigation

Which statement best explains the concept of a control sample in forensic analysis of a scene?

  1. A control sample is a duplicate of the suspect's known sample
  2. A control sample represents a known or unaffected reference used to distinguish target evidence from background material Correct answer.
  3. A control sample is the investigator's own DNA used for all comparisons
  4. A control sample is any item collected last at the scene

Explanation

Control samples provide a baseline of background or known material, helping analysts determine whether a detected substance or profile is meaningful. For example, an unaffected area of flooring serves as a control for accelerant analysis. Without controls, background contamination or naturally occurring substances can be misinterpreted.

Question 17Crime Scene Investigation

Which action best describes proper seizure of digital devices such as a smartphone found at a scene?

  1. Leave the device powered on and connected to Wi-Fi for convenience
  2. Allow bystanders to unlock the device for the investigator
  3. Immediately factory-reset the device to remove unwanted content
  4. Document the device's state, isolate it from networks, and package it to preserve data integrity Correct answer.

Explanation

Digital devices should be documented as found, isolated from networks to prevent remote wiping or alteration, and packaged appropriately. Preserving the device state supports later forensic examination. Resetting or allowing others to access the device destroys evidence.

Question 18Crime Scene Investigation

Which statement best describes the purpose of an evidence recovery log during a scene search?

  1. It documents the weather conditions during processing
  2. It replaces the need for photographs of the evidence
  3. It records each item's description, location, and collector to support later identification and chain of custody Correct answer.
  4. It lists only the names of suspects identified at the scene

Explanation

An evidence recovery log ties each item to its description, location, and collector, supporting identification and chain of custody. It complements photographs and sketches. It does not replace other documentation or record irrelevant details such as suspect names alone.

Question 19Crime Scene Investigation

During a search of a room, an investigator finds a small cartridge case on a patterned carpet. Which technique best aids in locating additional similar items?

  1. Shaking the carpet to reveal hidden items
  2. Conducting a systematic, methodical search pattern with adequate lighting and marking found items Correct answer.
  3. Relying on a single glance from the doorway
  4. Walking randomly while scanning the ceiling

Explanation

Systematic search patterns with good lighting reduce the chance of missing small items such as cartridge cases. Marking found items prevents double-counting and preserves location data. Random or casual inspection is unreliable.

Question 20Crime Scene Investigation

Which statement best explains why investigators should avoid excessive conversation and movement near a scene where biological evidence may be present?

  1. Airborne droplets and disturbance can contaminate samples and complicate DNA interpretation Correct answer.
  2. Movement is prohibited solely to protect the carpet from wear
  3. Conversation distracts the investigator from paperwork only
  4. Talking is restricted because it violates scene photography rules

Explanation

Speaking, sneezing, and unnecessary movement can introduce biological material and disturb trace evidence, complicating DNA interpretation. Minimizing activity around sensitive areas reduces contamination. This is a contamination-control measure, not a paperwork or photography rule.

Question 21Crime Scene Investigation

A scene involves a suspected drug laboratory. Which safety consideration is most important before entry?

  1. Assessing chemical, explosive, and respiratory hazards and requesting specialized personnel Correct answer.
  2. Handling unknown chemicals with bare hands to identify them by smell
  3. Turning on ventilation fans and smoking materials to test airflow
  4. Entering quickly to secure evidence before anyone else arrives

Explanation

Clandestine laboratories present chemical, explosive, and toxic hazards that require specialized assessment and protective equipment. Untrained entry risks injury and contamination. Safety planning precedes evidence collection.

Question 22Crime Scene Investigation

Which statement best describes the appropriate use of a reference sample from a known person in a criminal investigation?

  1. It is collected with proper consent or legal authority and used for comparison with questioned samples Correct answer.
  2. It is collected without documentation to save time
  3. It is unnecessary when a questioned sample exists
  4. It is always collected by the first officer without any authorization

Explanation

Known reference samples must be obtained lawfully, with consent or legal authority, and documented. They provide the comparison standard for questioned samples. Undocumented or unauthorized collection can render the comparison inadmissible.

Question 23Crime Scene Investigation

Which statement best describes the role of a forensic light source at a crime scene?

  1. It can reveal latent biological or trace evidence not visible under normal lighting Correct answer.
  2. It sterilizes the scene to prevent contamination
  3. It permanently alters evidence so it can be photographed more easily
  4. It replaces the need for chemical enhancement techniques

Explanation

Alternate light sources can make certain biological fluids, fibers, or trace materials fluoresce, aiding detection. They complement, rather than replace, chemical enhancement and documentation. They do not sterilize the scene or intentionally alter evidence.

Question 24Crime Scene Investigation

An investigator must document a scene where furniture has been moved during the incident. Which approach best preserves the ability to reconstruct the original layout?

  1. Photograph only the final positions without noting the changes
  2. Discard witness statements about the original arrangement
  3. Rearrange furniture to a standard layout before photographing
  4. Document the as-found positions and note any known original positions from witnesses or photographs Correct answer.

Explanation

Recording as-found positions and gathering information about prior arrangements supports reconstruction. Witness accounts and existing photographs can help establish the original layout. Rearranging or ignoring prior positions destroys contextual information.

Question 25Crime Scene Investigation

Which statement best describes the correct approach when a scene contains both physical and digital evidence that may be interdependent?

  1. Collect all digital devices first and ignore physical context
  2. Allow each investigator to work independently without a shared plan
  3. Coordinate documentation and collection so that physical context and digital data are preserved without one compromising the other Correct answer.
  4. Prioritize physical evidence exclusively and discard digital devices

Explanation

Interdependent evidence requires coordinated planning so that collecting one type does not destroy context for the other. For example, a device's location and state matter to the physical scene. A shared collection plan preserves both categories.

Question 26Crime Scene Investigation

At a scene where a body has been found, which action is the first priority before any evidence documentation begins?

  1. Begin photographing the body from multiple angles
  2. Collect the victim's clothing into paper bags
  3. Confirm scene safety and secure the area with a controlled perimeter Correct answer.
  4. Sketch the position of furniture in the room

Explanation

Scene processing always begins with ensuring responder and public safety and establishing control of the scene. Evidence documentation and collection come only after the scene is safe and secured, otherwise contamination and loss are likely.

Question 27Crime Scene Investigation

Which item is most appropriately packaged in a paper bag rather than a sealed plastic bag?

  1. A firearm with visible blood on the grip
  2. A sealed vial of liquid for toxicology
  3. Bloodstained clothing that is still damp Correct answer.
  4. A swab of wet biological material on a stick

Explanation

Damp biological evidence must be allowed to air-dry in breathable packaging to prevent mold and degradation. Paper bags permit drying, while sealed plastic traps moisture and promotes deterioration.

Question 28Crime Scene Investigation

Which statement best describes the purpose of a chain of custody record?

  1. It lists the equipment used during scene processing
  2. It records the investigator's opinion about the evidence's value
  3. It summarizes the scene sketch for the prosecutor
  4. It documents every transfer and handling of evidence from collection to court Correct answer.

Explanation

Chain of custody is a chronological record showing who collected, handled, and transferred each item, and when. It supports authentication of evidence in court by demonstrating continuous, accountable control.

Question 29Crime Scene Investigation

Which search pattern is generally most suitable for a large, open outdoor area such as a field?

  1. Wheel search radiating from a central point
  2. Zone search limited to a single quadrant
  3. Line or strip search with searchers spaced along a baseline Correct answer.
  4. Spiral search starting from the center outward

Explanation

A line or strip search uses multiple searchers moving in parallel across a baseline, covering large open areas efficiently. Spiral, zone, and wheel patterns are better suited to smaller or enclosed spaces.

Question 30Crime Scene Investigation

Which statement best describes the correct order of documentation at a crime scene?

  1. Sketch first, then collect, then photograph
  2. Collect evidence first, then photograph, then sketch
  3. Photograph the scene as found, then sketch, then collect evidence Correct answer.
  4. Collect evidence first, then sketch, then photograph

Explanation

Documentation proceeds from general to specific: photographs of the scene as found, then sketches with measurements, then collection. This preserves the original scene before items are moved.

Question 31Crime Scene Investigation

Which statement best describes the purpose of a scale or ruler placed in a photograph of evidence?

  1. It indicates the investigator's case number
  2. It marks the boundary of the secured perimeter
  3. It identifies the photographer's position
  4. It provides a size reference so dimensions can be interpreted later Correct answer.

Explanation

A scale in the image allows anyone viewing the photograph to judge the true size of the item. Without a reference, dimensions in a photograph cannot be reliably interpreted.

Question 32Crime Scene Investigation

Which statement best describes the role of a first responder in preserving a scene?

  1. Remove the body to a morgue before documentation
  2. Conduct a full evidence collection before detectives arrive
  3. Limit access, note the condition on arrival, and avoid unnecessary disturbance Correct answer.
  4. Interview all witnesses and record statements immediately

Explanation

The first responder secures the scene, records its condition on arrival, and minimizes disturbance until investigators take over. Evidence collection and body removal are later steps performed by qualified personnel.

Question 33Crime Scene Investigation

Which statement best explains why investigators should photograph a scene before moving any objects?

  1. The as-found arrangement may show relationships between items that matter to reconstruction Correct answer.
  2. The camera's flash changes the lighting permanently
  3. Photographs are required by law in every jurisdiction
  4. Photographs replace the need for sketches and notes

Explanation

The original arrangement of objects can reveal spatial relationships and events that matter for reconstruction. Once items are moved, that context is lost and cannot be recovered later.

Question 34Crime Scene Investigation

An investigator finds a bloodstain on a porous surface. Which collection method best preserves the stain for DNA analysis?

  1. Collect the entire item without documentation
  2. Scrape the dried blood into a plastic vial
  3. Seal the item in a plastic bag while still wet
  4. Cut the stained portion of the substrate if it can be removed, or swab with a slightly moistened sterile swab Correct answer.

Explanation

On porous surfaces, removing the stained substrate or transferring the stain to a sterile swab preserves the sample. Dry, breathable packaging is then used to prevent degradation.

Question 35Crime Scene Investigation

An investigator observes a faint shoe impression on a light-colored tile floor. Which technique best enhances its visibility before photography?

  1. Direct overhead flash
  2. Oblique lighting from a low angle Correct answer.
  3. Chemical enhancement with ninhydrin
  4. Ultraviolet light only

Explanation

Oblique or side lighting at a low angle casts shadows that reveal subtle surface impressions. Direct flash flattens detail, and chemical enhancement is inappropriate for visible surface impressions.

Question 36Crime Scene Investigation

An investigator must collect a firearm found at a scene. Which practice best preserves both safety and evidence?

  1. Pick up the firearm by inserting a pen into the barrel
  2. Cock the firearm to check whether it is loaded
  3. Unload only if trained and necessary, record the condition, and package in a rigid box with the muzzle secured Correct answer.
  4. Wrap the firearm in a plastic bag for transport

Explanation

Firearms are handled with safety first, with condition documented, and packaged in rigid containers that protect the item and prevent discharge. Inserting objects into the barrel destroys potential evidence.

Question 37Crime Scene Investigation

An investigator finds a latent fingerprint on a glass surface. Which sequence best reflects accepted practice?

  1. Photograph in place, then develop with powder and lift with tape Correct answer.
  2. Lift with tape first, then photograph the lifted print
  3. Develop with ninhydrin, then lift with tape
  4. Wash the surface, then apply powder

Explanation

Latent prints are documented in place before any enhancement or lifting. Powder and tape are appropriate for non-porous surfaces such as glass.

Question 38Crime Scene Investigation

An investigator must collect a blood sample from a suspect for comparison. Which statement best describes the appropriate approach?

  1. Obtain the sample by a qualified medical professional following legal authorization Correct answer.
  2. Have the investigator draw the sample personally
  3. Collect the sample using the same swabs used at the scene
  4. Use the suspect's discarded tissue without any documentation

Explanation

Reference samples from known persons require legal authorization and are collected by qualified medical personnel. Proper documentation maintains the chain of custody for comparison purposes.

Question 39Crime Scene Investigation

An investigator finds a small piece of glass on a carpet. Which technique best aids recovery?

  1. Use a magnet to attract the glass
  2. Shake the carpet outdoors
  3. Use a vacuum with a filter trap or forceps under good lighting Correct answer.
  4. Use bare hands to pick up the fragment

Explanation

Small fragments are recovered with forceps or a filtered vacuum that captures particles without loss. Bare hands risk injury and contamination, and glass is not magnetic.

Question 40Crime Scene Investigation

An investigator finds a handwritten note at a scene. Which practice best preserves it for questioned-document examination?

  1. Laminate the note for protection
  2. Handle by the edges, place in a paper envelope, and avoid folding or marking the paper Correct answer.
  3. Fold the note and place it in a plastic bag
  4. Write initials directly on the note

Explanation

Documents are handled minimally by the edges and packaged flat in paper to avoid altering the writing surface. Marking or folding can interfere with ink and paper analysis.

Question 41Crime Scene Investigation

An investigator needs to collect a soil sample from a footprint. Which approach best supports comparison with a suspect's shoes?

  1. Collect soil from within the impression and a control sample from nearby undisturbed soil Correct answer.
  2. Collect only the soil from the impression
  3. Collect soil from a different location entirely
  4. Collect the shoe without any soil sample

Explanation

Comparison requires both the questioned sample from the impression and a control sample from the immediate surroundings. The control helps distinguish soil unique to the impression from general area soil.

Question 42Crime Scene Investigation

An investigator arrives at a scene with a strong odor of gasoline and visible liquid on the floor. Which action is the most important initial step?

  1. Open windows to ventilate the area
  2. Evacuate and request fire or hazardous materials assessment before entry Correct answer.
  3. Begin photographing the liquid immediately
  4. Collect a sample of the liquid with a syringe

Explanation

Flammable liquids create an explosion and fire hazard that must be assessed before entry. Safety of responders takes precedence over documentation and collection.

Question 43Crime Scene Investigation

An investigator finds a spent bullet embedded in a wall. Which practice best preserves it for firearms examination?

  1. Dig it out with a metal screwdriver
  2. Package it loosely in a plastic bag with other metal items
  3. Photograph in place, then remove carefully with padded tools and package in a cushioned container Correct answer.
  4. Wash it with water before packaging

Explanation

Bullets are documented in place and removed with padded tools to preserve rifling marks, then packaged individually with cushioning. Metal tools can add marks that interfere with comparison.

Question 44Crime Scene Investigation

An investigator observes a bloodstain pattern on a wall. Which approach best supports later reconstruction?

  1. Photograph only a close-up of one stain
  2. Collect the wall without measuring the pattern
  3. Wipe the wall clean to collect the blood
  4. Photograph with scale from multiple angles and document the pattern's location and dimensions Correct answer.

Explanation

Bloodstain pattern reconstruction depends on documenting the overall pattern geometry, location, and dimensions with scale. Isolated close-ups or unmeasured collection lose the spatial context needed for analysis.

Question 45Crime Scene Investigation

An investigator must document a scene where a struggle has scattered objects across a room. Which approach best preserves the reconstruction value of the scene?

  1. Sketch only the room's fixed features
  2. Straighten the room first to make it easier to photograph
  3. Collect the most obvious items first and photograph later
  4. Document the overall scene and the relative positions of displaced items before any tidying Correct answer.

Explanation

Displaced objects and their relative positions carry reconstruction information about the struggle. Tidying or premature collection destroys spatial relationships that cannot be recovered.

Question 46Crime Scene Investigation

An investigator finds a smartphone at a scene that may contain evidence. Which practice best supports both preservation and later analysis?

  1. Turn the device on and browse its contents
  2. Remove the SIM card and discard it
  3. Isolate the device from networks, document its state, and package it to avoid power loss Correct answer.
  4. Place the device in a plastic bag with other electronics

Explanation

Digital devices are isolated from networks to prevent remote wiping and documented as found, then packaged to preserve power and integrity. Browsing the device alters its state and risks data loss.

Question 47Crime Scene Investigation

An investigator finds a partially burned document in a fireplace. Which practice best preserves it?

  1. Spray it with water to prevent further burning
  2. Seal it in a plastic bag while still warm
  3. Pick it up by the charred edges with bare fingers
  4. Support the fragile material on a rigid surface and package it flat without compression Correct answer.

Explanation

Charred documents are extremely fragile and must be supported on a rigid surface and kept flat. Compression or moisture can cause the material to crumble or the ink to be lost.

Question 48Crime Scene Investigation

An investigator is evaluating whether a scene is a primary or secondary scene. Which reasoning best reflects accepted practice?

  1. A primary scene is where the incident occurred, while secondary scenes are related locations with associated evidence Correct answer.
  2. A primary scene is always the largest location
  3. A secondary scene is any location without physical evidence
  4. The distinction depends on the number of investigators present

Explanation

Primary and secondary scene designations relate to where the incident occurred versus related locations holding associated evidence. Size, personnel counts, and evidence presence do not define the distinction.

Question 49Crime Scene Investigation

An investigator must decide whether to collect an entire item or sample a portion of it. Which reasoning best reflects accepted practice?

  1. Always sample a portion to save storage space
  2. Sample only when instructed by the prosecutor
  3. Collect the entire item when feasible, and sample only when the item is too large or the evidence is distributed Correct answer.
  4. Always collect the entire item regardless of size

Explanation

Whole-item collection preserves the full evidentiary context when practical. Sampling is a fallback for oversized items or distributed evidence, and it must be documented carefully.

Question 50Crime Scene Investigation

An investigator finds a bloodstain near a doorway and must decide whether it is a transfer or a passive stain. Which approach best reflects accepted practice?

  1. Classify it immediately based on its color
  2. Discard the stain if it seems unimportant
  3. Document the stain's shape and context and defer classification to qualified pattern analysis Correct answer.
  4. Assume it is a transfer stain because of its location

Explanation

Stain classification depends on shape, distribution, and context, and is properly done by qualified analysts. Premature classification based on color or location risks error.