Police Officer how-to
How to Protect a Crime Scene
The first officer on scene preserves evidence for investigators.
The first officer on scene preserves evidence for investigators. In short: ensure; establish; control, then complete the remaining steps below.
Step by step
Ensure safety and provide aid to anyone injured.
Establish a perimeter larger than you think you need.
Control access and start a scene log of everyone entering.
Prevent anyone from touching, moving or contaminating evidence.
Note observations: conditions, lighting, weather, smells, open doors.
Identify and separate witnesses.
Brief investigators when they arrive and document your actions.
Safety reminders for police officers
- Follow officer safety training and agency policies
- Wear body armor and seat belts
- Use de-escalation and call for backup when appropriate
- Seek peer support and wellness resources after traumatic events
Key terms
POST · Probable cause · Reasonable suspicion · Miranda warning · De-escalation · Use-of-force policy: see the full police officer glossary.