Illinois Security Guard Practice Exam 2025 - Free Security Guard Practice Questions and Study Guide

The correct answer is supported by the legal principle of "citizen's arrest," which allows a security guard to detain a suspect when they have probable cause to believe that the individual has committed a crime. This means the guard must have sufficient reason based on facts to suspect that a crime has occurred. Furthermore, the detention must be reasonable in duration and purpose, specifically to hold the individual until law enforcement can take over the situation.

Proper training often emphasizes the need for probable cause, as acting without this could lead to unlawful detainment and potential legal repercussions for the guard and their employer. This ensures that the security guard acts within the bounds of the law, maintaining their authority while protecting the rights of individuals. The reasonable period is crucial because it limits the time an individual can be held, promoting fairness and preventing abuse of power.

In contrast, other options lack the necessary constraints that govern lawful detention. Detaining someone at one's discretion or simply because there is a perceived safety risk lacks the necessary legal foundation. Similarly, witnessing a crime being committed is relevant, but it doesn't encompass all situations where probable cause might exist. The nuance of reasonable cause is paramount for lawful detention by a security guard.