Police officers touch the back of a car during a traffic stop for several important reasons related to safety and evidence:
- To leave their fingerprints on the car as physical evidence that they were present at the scene. This helps prove the officer's presence if something goes wrong, such as an attack or disappearance during the stop.
- To ensure the trunk or hatchback is securely closed, preventing anyone from hiding inside who could pose a danger by jumping out unexpectedly.
- To assess the situation by observing the driver's reaction when startled by the touch, which can provide clues about the driver's mental state or suspicious behavior.
- It also serves as a precautionary and safety measure by documenting the officer's interaction with the vehicle for legal and investigation purposes.
This practice, though rooted in times before body and dash cameras were common, remains a routine safety protocol for officers during traffic stops.
