Observation & ReportsQuestion 141 of 200

Arriving first at the scene of a likely crime, the guard's primary preservation duty is to:

a.Begin a full forensic search of the area at once, so that anything of evidentiary value is found and secured before it can be removed or destroyed by someone returning to the scene later that same night
b.Render any needed first aid and call 911/employer, then secure the perimeter, prevent unauthorized entry, avoid touching or moving evidence except where necessary for safety or first aid, identify and detain available witnesses, and brief responding officers — minimizing contamination is paramount
c.Clean up the scene so that the premises are restored to their normal appearance well before customers or residents arrive in the morning and see for themselves what has happened there during the night
d.Interview the suspect at length before the police arrive, so that a full account is obtained while the events are still fresh in mind and the person has not yet had time to construct an innocent explanation of their own

Explanation

First-responder duties at a likely crime scene, in order: (1) ensure safety — your own, then others, rendering first aid if trained; (2) call 911 and notify supervisor/dispatch; (3) secure the perimeter with whatever materials are available; (4) prevent entry by anyone unauthorized — including coworkers and curious bystanders; (5) avoid touching or moving anything unless required for life safety; (6) note witnesses and ask them to remain; (7) brief arriving officers on what you saw, did, and where. Forensic search (a) is the detectives' role. Cleaning (c) destroys evidence. Suspect interviews (d) are best left to police given Miranda and §841 considerations.

Law Reference: Crime-scene preservation doctrine

This topic, taught in full in the California Guard Card (BSIS Security Guard) guide. California Guard Card — Complete Study Guide (2026) — PDF + EPUB, $9.99 · 14-day refund →

Practice all 200 questions free — no signup required.

Own the complete California Guard Card (BSIS Security Guard) guide — PDF + EPUB, $9.99 →

Related questions on this topic

Last reviewed: · editorial process

PrepPass team · Verified against California BSIS Guard Card Exam · How we review
Report