9.3 Preserving the Incident Scene & Courtroom Demeanor

9.3 Preserving the Incident Scene & Courtroom Demeanor

Quick Answer: Preserve scenes by identifying evidence, securing the immediate area, and avoiding tampering or removal; identify witnesses; and in court be truthful, professional, and prepared by reviewing your report before you testify.

free CA Security Guard practice questionsPractice questions with detailed explanations

Identifying Evidence

Evidence is anything that tends to prove or disprove a fact about an incident: physical objects, biological material, documents, digital media, and sometimes the condition of a place (broken lock, forced door).

Common categories on security posts:

Identification starts with a slow visual sweep: What is out of place? What could link a person to an act? Mentally (and then in your report) note location of each item relative to fixed landmarks (“knife on tile three feet north of the lobby desk”).

You are not a crime-lab technician. Identifying evidence means recognizing what matters and protecting it—not collecting DNA swabs unless your employer’s specialized protocol and training say otherwise.

Care and Handling of Evidence

Default rule: minimize handling. Every touch can transfer fingerprints, DNA, or move an item from its evidentiary position.

Guidelines:

1. Do not pick up weapons or drugs to “show the police later” unless imminent safety requires securing a weapon under clear policy—and then document exactly what you did and why.
2. Do not put evidence in your pocket or personal bag. Chain of custody collapses when items vanish into a guard’s jacket.
3. Gloves and biohazard awareness — Bloodborne pathogen training intersects here; avoid bare-hand contact with bodily fluids.
4. Digital evidence — Stop overwriting CCTV if your system allows export/hold; do not delete camera clips to “help” a preferred party. Note the camera number and time window for investigators.
5. If policy requires you to take temporary custody (rare; usually law enforcement does this), record time, item description, from whom/where obtained, and to whom transferred—with signatures when used.

Care also means protecting evidence from weather, curious employees, and cleanup crews. A well-meaning janitor mopping a blood trail can erase a case.

Securing the Immediate Area

Securing means controlling access so the scene stays as found:

• Establish a perimeter with what you have: locked doors, cones, caution tape, furniture barriers, or a posted officer.
• Keep unauthorized people out—including coworkers who want photos for group chat.
• Allow entry for emergency medical care and fire response first when lives are at stake; life safety outranks pristine evidence, but still note what moved.
• Once the area is stable, maintain the perimeter until relieved by law enforcement or a supervisor who assumes scene responsibility.
• For large properties, secure the immediate area of the incident first; you cannot rope off an entire campus alone.

Communicate clearly on the radio: location, type of incident, whether weapons/hazards exist, and that the scene is being held.

Legal Issues: Tampering and Removal

California law and civil liability treat interference with evidence seriously. For exam and field purposes, remember:

• Tampering includes altering, concealing, destroying, or fabricating evidence to affect an investigation or proceeding.
• Removal of items from a scene without authority can look like theft or obstruction—even if you intended to “keep it safe.”
• Cleaning up a fight scene before police arrive because the client wants the store open can destroy prosecutions and create employer/guard liability.
• Taking a “souvenir” knife or shoplifter’s ID “as a trophy” is misconduct.
• Coaching witnesses to change stories, or writing a report that invents observations, creates separate legal exposure (false report, perjury risk later).

If you accidentally move something (kick a casing while rendering aid), document the original position as best you can and tell responding officers immediately. Honesty about contamination beats a cover-up.

Private security also lacks the crime-scene authority of peace officers. You secure and notify; you do not run a parallel forensic investigation that contradicts police direction once they own the scene.

Witness and Participant Identification

BSIS specifically includes witness/participant identification. After safety is under control:

• Ask for names, phone numbers, and emails of people who saw or heard the event.
• Note roles: victim, suspect/participant, independent witness, employee, customer.
• Record a brief statement of what they claim to have observed—without forcing them to stay if they refuse (you are not a cop compelling statements).
• Separate angry participants when safe to reduce further violence and statement contamination.
• Identify employees who can pull video or access logs.

Do not bully witnesses. Do not promise outcomes (“He’ll definitely go to prison”). Get identifiers and preserve cooperation for investigators.

Courtroom Demeanor Basics

Many guards never testify; some will—in criminal cases, civil lawsuits, unemployment hearings, or BSIS/administrative matters. Courtroom demeanor electives reinforce professional testimony habits:

Before a hearing, re-read your incident report, diagram, and any supplemental notes. If you find a genuine error, tell the attorney or investigator who called you—do not silently “fix it” on the stand by inventing a new version. Bring a copy only if instructed; follow court and counsel rules about documents.

Connecting Scene Work to Testimony

Good scene preservation produces good reports; good reports produce credible testimony. Weak scenes produce “I think maybe” answers that juries discount. Treat every serious incident as if you may have to explain your actions under oath months later—because you might.