MI Private Investigator study materials
MI Private Investigator study resources

MI Private Investigator key terms

MI Private Investigator · Get comfortable with the vocabulary.

Private Security Business and Security Alarm Act

Michigan statute that governs licensing and conduct of private security businesses, private investigators, and security alarm contractors, and that creates the state board and department oversight of those licensees.

Related: Department of Licensing and Regulatory Affairs, Private Investigator License, Prohibited Conduct (Licensee)
Department of Licensing and Regulatory Affairs (LARA)

Michigan executive department that administers licensing, investigates complaints against licensees, and issues disciplinary actions under the private security statute through its licensing bureau.

Related: Private Security Business and Security Alarm Act, License Sanction
Private Investigator License

Credential issued by the state to a person who meets age, experience, education, and examination requirements and who is employed by or operates a licensed private security business to conduct investigations for hire.

Related: Private Security Business License, Qualifying Officer
Private Security Business License

License required for an entity that sells or performs investigative or security services for compensation in Michigan; the business must designate a qualified licensee responsible for compliance.

Related: Qualifying Officer, Private Investigator License
Qualifying Officer

Individual licensee designated by a licensed agency as the person who meets statutory qualifications and is accountable for the agency's lawful operation and supervision of its employees.

Related: Private Security Business License, Employee Registration
Employee Registration

Requirement that individuals performing investigative work for a licensed agency be registered with the state, often involving fingerprinting and a background check, before they may work cases.

Related: Qualifying Officer, License Sanction
Prohibited Conduct (Licensee)

Statutorily barred behaviors such as impersonating a peace officer, wearing a badge or uniform suggesting police authority, making false statements to obtain information, or divulging client confidences without consent.

Related: Impersonating a Peace Officer, Confidentiality Obligation
License Sanction

Disciplinary action by the state against a licensee, ranging from reprimand and fines to suspension or revocation, imposed after an administrative complaint and hearing process.

Related: Department of Licensing and Regulatory Affairs (LARA), Employee Registration
Impersonating a Peace Officer

Crime of falsely representing oneself as a law enforcement officer or using insignia, badges, or language to create that impression, which is also grounds for license discipline.

Related: Prohibited Conduct (Licensee), Citizen's Arrest Authority
Fourth Amendment

Constitutional protection against unreasonable searches and seizures by government actors; it generally does not bind private investigators acting without state direction or involvement.

Related: State Action Doctrine, Trespass
State Action Doctrine

Principle that constitutional restraints apply only to government conduct, so a private investigator becomes bound when acting as an agent of or in concert with law enforcement.

Related: Fourth Amendment, Private Search Doctrine
Private Search Doctrine

Rule that evidence a private party obtains without government involvement is not subject to the Fourth Amendment exclusionary rule, even if the search would be unlawful for police.

Related: State Action Doctrine, Exclusionary Rule
Trespass

Intentional entry onto land or interference with personal property without consent or legal authority; a private investigator who enters private property without permission may face civil liability.

Related: Intrusion Upon Seclusion, Fourth Amendment
Intrusion Upon Seclusion

Privacy tort imposing liability for intentionally intruding, physically or otherwise, upon another's solitude or private affairs in a manner highly offensive to a reasonable person.

Related: Trespass, Reasonable Expectation of Privacy
Reasonable Expectation of Privacy

Standard asking whether a person exhibited an actual expectation of privacy and whether society recognizes it as reasonable; it shapes where surveillance and recording are permissible.

Related: Intrusion Upon Seclusion, Public View Doctrine
Public View Doctrine

Concept that observations made from a lawful vantage point of things exposed to public view, such as activity on a public street, generally do not violate privacy rights.

Related: Reasonable Expectation of Privacy, Surveillance
Stalking

Course of conduct involving repeated unwanted contact, following, or harassment that would cause a reasonable person to feel terrorized, frightened, intimidated, threatened, or harassed.

Related: Surveillance, Civil Rights Act (Michigan)
Eavesdropping and Recording Law

Statutory rules governing interception of oral communications and recording conversations; Michigan generally restricts recording where the speaker has a reasonable expectation of privacy without consent.

Related: Reasonable Expectation of Privacy, Surveillance
Civil Rights Act (Michigan)

State law prohibiting discrimination in employment, housing, and public accommodations; investigators handling workplace or tenant cases must avoid conduct that violates protected-class rights.

Related: Stalking, Retaliation
Citizen's Arrest Authority

Limited common-law and statutory power of a private person to detain another for a felony or breach of peace committed in the person's presence, exercised at legal risk if wrong.

Related: False Imprisonment, Shopkeeper's Privilege
Shopkeeper's Privilege

Statutory or common-law defense allowing a merchant or agent to detain a suspected shoplifter for a reasonable time and in a reasonable manner to investigate, based on probable cause.

Related: Citizen's Arrest Authority, False Imprisonment
False Imprisonment

Tort and potential crime of intentionally confining a person without lawful authority or consent; a private investigator who detains someone beyond legal limits may be liable.

Related: Citizen's Arrest Authority, Excessive Force
Excessive Force

Use of more physical force than a reasonable person would deem necessary under the circumstances; private persons may use only force proportionate to the threat they face.

Related: False Imprisonment, Use of Force (Private Person)
Use of Force (Private Person)

Legal standard permitting a private citizen to use reasonable force to defend self or others or to effect a lawful arrest, but never deadly force solely to protect property.

Related: Excessive Force, Citizen's Arrest Authority
Exclusionary Rule

Rule barring government use at trial of evidence obtained through unconstitutional searches or seizures; it generally does not apply to evidence gathered purely by private investigators.

Related: Private Search Doctrine, Chain of Custody
Chain of Custody

Documented, unbroken record of who handled evidence, when, and where, from collection through storage and transfer, used to prove the evidence is authentic and unaltered.

Related: Evidence Collection, Case File Integrity
Miranda Warning

Advisement of rights required before custodial interrogation by law enforcement; private investigators are not required to give it unless acting as government agents.

Related: State Action Doctrine, Interviewing
Interviewing

Structured questioning of witnesses, subjects, or complainants to gather facts, conducted without coercion and with accurate documentation of questions, answers, and the interviewee's demeanor.

Related: Written Statement, Report Writing
Written Statement

Signed account by a witness or subject, ideally in the person's own words and handwriting or reviewed and corrected by them, that preserves testimony and reduces later disputes.

Related: Interviewing, Case File Integrity
Evidence Collection

Systematic gathering, labeling, packaging, and preserving of physical or digital items relevant to a case so that their condition and authenticity can be demonstrated later.

Related: Chain of Custody, Case File Integrity
Report Writing

Preparation of clear, chronological, factual narratives covering who, what, when, where, and how, distinguishing observed facts from hearsay and avoiding conclusions the evidence does not support.

Related: Interviewing, Contemporaneous Notes
Contemporaneous Notes

Notes recorded at or near the time of an event or interview, which support later reports and are discoverable, so they must be accurate, dated, and free of speculation.

Related: Report Writing, Case File Integrity
Case File Integrity

Practice of maintaining complete, secure, access-controlled records with a documented audit trail, preventing alteration or loss and preserving confidentiality of client information.

Related: Chain of Custody, Confidentiality Obligation
Surveillance

Covert or overt observation of a person, place, or activity to document facts, conducted from lawful vantage points and limited to what is visible or audible without trespass or unlawful interception.

Related: Public View Doctrine, Counter-Surveillance
Counter-Surveillance

Techniques used to detect, evade, or document someone who is watching a subject, including route planning, mirror checks, and identifying repeated vehicles or persons.

Related: Surveillance, Surveillance Log
Surveillance Log

Time-stamped record of observations, locations, vehicle descriptions, and actions during surveillance that supports later testimony and demonstrates continuity of observation.

Related: Surveillance, Contemporaneous Notes
Evidence Photography

Photographing or videotaping scenes and items with attention to date, time, location, lighting, and original file preservation so images remain admissible and unaltered.

Related: Metadata Preservation, Chain of Custody
Metadata Preservation

Retaining original digital files and their embedded creation data, avoiding cropping or editing of originals, so authenticity of images and recordings can be verified.

Related: Evidence Photography, Chain of Custody
Fair Credit Reporting Act (FCRA)

Federal law governing consumer reports and investigative consumer reports, imposing notice, consent, disclosure, and dispute obligations on those who procure them for employment or tenant screening.

Related: Investigative Consumer Report, Driver's Privacy Protection Act
Investigative Consumer Report

Consumer report containing information on character, general reputation, or lifestyle obtained through personal interviews, triggering specific notice and disclosure duties under federal law.

Related: Fair Credit Reporting Act (FCRA), Permissible Purpose
Driver's Privacy Protection Act

Federal statute restricting disclosure of personal information from motor vehicle records to permitted uses, requiring investigators to certify a permissible purpose before obtaining data.

Related: Permissible Purpose, Public Records
Permissible Purpose

Legally recognized reason, such as litigation, employment screening with consent, or debt collection, that authorizes access to restricted records like credit or motor vehicle data.

Related: Driver's Privacy Protection Act, Fair Credit Reporting Act (FCRA)
Public Records

Documents maintained by government agencies, such as court filings, property records, and certain licensing files, that are generally accessible to the public subject to statutory exemptions.

Related: Court Records Search, Driver's Privacy Protection Act
Court Records Search

Review of civil, criminal, and probate filings and dockets, often through online portals or clerk offices, to establish litigation history, judgments, and case outcomes.

Related: Public Records, Skip Tracing
Skip Tracing

Locating a person whose whereabouts are unknown using lawful sources such as public records, databases, interviews, and surveillance, without deception that violates law or ethics.

Related: Public Records, Pretexting
Confidentiality Obligation

Duty not to reveal client information learned during an engagement except as authorized, required by law or court order, or necessary to prevent serious harm.

Related: Conflict of Interest, Case File Integrity
Conflict of Interest

Situation where an investigator's other client, personal interest, or prior relationship could bias the work or breach a duty, requiring disclosure and often withdrawal from the matter.

Related: Confidentiality Obligation, Engagement Letter
Pretexting

Obtaining information by using a false identity or fabricated story; lawful in some contexts but prohibited when used to access financial records or impersonate government officials.

Related: Skip Tracing, Impersonating a Peace Officer
Engagement Letter

Written agreement defining scope of work, deliverables, fees, expenses, limitations, and client responsibilities, reducing misunderstandings and providing evidence of the agreed terms.

Related: Retainer, Conflict of Interest
Retainer

Advance fee paid by a client to secure an investigator's availability and applied against future work, typically held in trust and accounted for with itemized billing.

Related: Engagement Letter, Contingency Fee
Contingency Fee

Compensation arrangement where payment depends on a specified result; investigators must consider whether such terms create ethical problems or improper incentives in their engagements.

Related: Retainer, Engagement Letter
Errors and Omissions Insurance

Professional liability coverage protecting an investigative firm against claims of negligence, missed deadlines, or failure to perform services as promised.

Related: General Liability Insurance, Engagement Letter
General Liability Insurance

Coverage for third-party claims of bodily injury or property damage arising from business operations, such as accidents during surveillance or on-site work.

Related: Errors and Omissions Insurance, Workplace Safety Plan
Workplace Safety Plan

Documented procedures addressing risks such as violence, vehicle hazards, and lone working, including check-in protocols, risk assessment, and emergency communication for field investigators.

Related: General Liability Insurance, Personal Protection
Personal Protection

Measures an investigator takes to reduce risk of harm, including situational awareness, defensive driving, de-escalation, and avoiding confrontations while documenting rather than intervening.

Related: Workplace Safety Plan, Use of Force (Private Person)
Retaliation

Adverse action taken against a person for asserting legal rights or cooperating with an investigation, which can create independent liability for clients and investigators involved.

Related: Civil Rights Act (Michigan), Conflict of Interest