CA Security Guard study materials
CA Security Guard study resources

CA Security Guard key terms

CA Security Guard · Get comfortable with the vocabulary.

Citizen's Arrest

A detention or arrest made by a private person, including a security guard, who witnesses a crime or has probable cause to believe one occurred; the person must be delivered to a peace officer without unnecessary delay.

Related: Probable Cause, Merchant's Privilege, Private Security Officer's Authority
Merchant's Privilege

A legal protection allowing a merchant or employee to detain a person for a reasonable time and in a reasonable manner to investigate suspected shoplifting, recover property, and summon law enforcement.

Related: Citizen's Arrest, Probable Cause, Reasonable Force
Probable Cause

Facts and circumstances that would lead a reasonable person to believe a crime has been, is being, or will be committed and that a particular person is involved.

Related: Citizen's Arrest, Investigative Detention
Investigative Detention

A brief stop of a person based on specific, articulable facts suggesting involvement in criminal activity, limited in scope and duration to confirming or dispelling the suspicion.

Related: Probable Cause, Arrest
Arrest

Taking a person into custody to answer for a criminal offense; private security officers generally make arrests only under citizen's arrest authority and must promptly transfer custody to law enforcement.

Related: Citizen's Arrest, Probable Cause
Private Security Officer's Authority

A contracted guard generally has no more arrest or search power than a private citizen; authority comes from citizen's arrest law, the property owner's consent, and company policy.

Related: Citizen's Arrest, Merchant's Privilege
Reasonable Force

The amount of force a reasonable person would use under similar circumstances, limited to what is necessary to accomplish a lawful purpose such as self-defense or an arrest.

Related: Deadly Force, De-escalation, Objective Reasonableness
Deadly Force

Force likely to cause death or serious bodily injury; in California it may be used only when necessary to defend against an imminent threat of death or serious injury to oneself or others.

Related: Reasonable Force, Objective Reasonableness
De-escalation

Communication and tactical techniques intended to reduce tension, gain voluntary compliance, and lessen the need for force whenever it is safe and feasible to do so.

Related: Reasonable Force, Active Listening
Objective Reasonableness

The legal test asking whether a reasonable officer facing the same facts would have used the same force, judged from the perspective of a reasonable person on scene without hindsight.

Related: Reasonable Force, Deadly Force, Duty to Intercede
Duty to Intercede

The obligation of a guard who sees another guard using clearly excessive force to intervene when reasonably possible and to report the conduct afterward.

Related: Reasonable Force, Objective Reasonableness
Positional Asphyxia

Death or injury from restricted breathing caused by body position, such as weight on the back or a bent neck; guards must monitor and reposition restrained people.

Related: Reasonable Force, De-escalation
Active Listening

Fully concentrating on a speaker, listening for both facts and feelings, and confirming understanding through paraphrasing and questions rather than interrupting.

Related: Paraphrasing, Open-Ended Question, Nonverbal Communication
Open-Ended Question

A question that cannot be answered with a simple yes or no and invites the person to give detail, such as 'What happened next?'

Related: Active Listening, Paraphrasing
Paraphrasing

Restating in your own words what a person has said in order to confirm understanding and show that you are listening.

Related: Active Listening, Open-Ended Question
Nonverbal Communication

Body language, posture, facial expression, tone of voice, and distance that convey meaning, often shaping how a message is received more than the words alone.

Related: Active Listening, Command Presence
Radio Protocol

Standard procedures for radio transmissions, including clear speech, identifying yourself, waiting for acknowledgment, and using plain language or approved codes.

Related: Active Listening
Chain of Custody

A documented, unbroken record of who handled evidence, when, and where, from collection through court, used to show the evidence has not been altered.

Related: Incident Report, Contemporaneous Notes
Contemporaneous Notes

Notes made at or near the time of an event while memory is fresh, which may be used to refresh recollection and to support the accuracy of a report.

Related: Incident Report, Chain of Custody
Incident Report

A written narrative documenting what happened, who was involved, actions taken, and evidence collected; it should be factual, chronological, and complete.

Related: Contemporaneous Notes, Chain of Custody, Subpoena
Eyewitness Identification

Having a witness identify a suspect, ideally through fair procedures that avoid suggestion, because memory can be distorted by stress and leading questions.

Related: Incident Report, Contemporaneous Notes
Community Relations

The ongoing effort by security personnel to build trust and cooperation with the public through courteous, fair, consistent, and professional interactions that reflect well on the employer and the community.

Related: Cultural Awareness, Implicit Bias
Implicit Bias

Unconscious attitudes or stereotypes that can affect perception, decisions, and behavior; recognizing them helps guards treat people fairly and avoid assumptions.

Related: Racial Profiling, Cultural Awareness
Racial Profiling

Selecting or treating someone differently for surveillance, stops, or enforcement based on race, ethnicity, or religion rather than behavior or evidence; it is prohibited.

Related: Implicit Bias, Community Relations
Cultural Awareness

Understanding that people's backgrounds, languages, and customs differ, and adjusting communication and expectations so interactions are respectful and effective.

Related: Community Relations, Implicit Bias
Crowd Control

Managing groups through planning, communication, positioning, and coordinated movement to keep people safe and maintain order or access.

Related: Command Presence, Perimeter, Egress
Command Presence

Projecting calm confidence through posture, voice, and clear direction so that people look to you for guidance during a crowd situation or emergency.

Related: Crowd Control, Nonverbal Communication
Perimeter

An outer boundary established around an incident to contain it, control access, and keep bystanders at a safe distance.

Related: Crowd Control, Egress
Egress

A clear path for people to exit an area; keeping exits and routes unobstructed is essential during crowd movement and emergencies.

Related: Evacuation, Crowd Control
Subpoena

A court order requiring a person to appear at a specified time and place to testify or produce documents; ignoring it can be punished as contempt.

Related: Direct Examination, Cross-Examination
Direct Examination

Questioning of a witness by the side that called them, typically using open questions that let the witness tell the story in their own words.

Related: Cross-Examination, Credibility, Hearsay
Cross-Examination

Questioning of a witness by the opposing side, often using leading questions to test the witness's accuracy, consistency, and credibility.

Related: Direct Examination, Credibility
Hearsay

A statement made outside of court offered to prove its truth; it is generally inadmissible, so guards should testify about what they personally saw or heard.

Related: Direct Examination, Credibility
Credibility

The believability of a witness, shaped by consistency, demeanor, accuracy, and possible bias; preparation and truthful testimony build it.

Related: Cross-Examination, Direct Examination
Emergency Action Plan

A written plan describing roles, alarms, evacuation routes, and communication procedures for emergencies such as fire, medical crisis, or violence.

Related: Evacuation, Shelter-in-Place, Crowd Control
Evacuation

Moving people out of a building or area to a safe location using designated routes, assembly points, and clear direction.

Related: Emergency Action Plan, Egress, Shelter-in-Place
Shelter-in-Place

Keeping people inside a secure area during an external hazard such as a chemical release or active threat, with doors locked and ventilation controlled.

Related: Emergency Action Plan, Evacuation
AED

An automated external defibrillator, a portable device that analyzes heart rhythm and delivers a shock to restore a normal rhythm in sudden cardiac arrest.

Related: Emergency Action Plan, Fire Extinguisher PASS
Fire Extinguisher PASS

The technique for using a fire extinguisher: pull the pin, aim at the base of the fire, squeeze the handle, and sweep side to side while keeping an exit behind you.

Related: AED, Emergency Action Plan, Evacuation