Legal Powers, Authority, and Limitations of a Security Guard
This domain tests whether you understand that a Michigan private security guard is ordinarily a private citizen with no general police powers. A guard’s authority comes from the same sources available to other citizens: self-defense, defense of others, protection of property within legal limits, consent, contract-based rules, and a lawful citizen’s arrest followed by prompt police involvement. The exam often asks what a guard may not do, because excess authority creates civil and criminal liability.
Core concepts
- A guard may enforce an employer’s or client’s rules only within the property and only in ways that do not violate law. Private rules do not authorize assault, false imprisonment, or unlawful searches.
- A guard may ask questions and request consent, but a person may refuse. Refusal alone is not a crime.
- A guard may intervene to stop an imminent threat to persons or property using reasonable force, but must disengage when the threat ends.
- A guard may make a citizen’s arrest only when the legal elements are met, then must contact police promptly. The guard should not act as judge, jury, or interrogator.
- A guard must not impersonate police, display police insignia, or claim powers of search or arrest beyond the law.
- If a guard acts jointly with police or at police direction, the guard may be treated as a state actor for constitutional purposes. Avoid conducting searches at police request without clear legal authority.
Worked example
A guard sees a customer placing store items in a bag and walking toward the exit. The guard may observe, may ask the customer to stop, and may detain only if the legal basis for a citizen’s arrest is present. The guard may not automatically search the bag. If the customer refuses a consent search, the guard should call police and preserve observations. Force is limited to what is reasonably necessary to prevent escape or harm, not punishment.
Traps that cost marks
Believing a badge creates police authority; searching bags or lockers without consent or legal basis; detaining someone merely because they are “suspicious”; and continuing a confrontation after the threat has ended.