When police pull you over, you may notice the officer briefly touching the back or tail light of your car before approaching the driver’s window. According to former law enforcement officers, the gesture can serve practical safety and identification purposes: checking that the trunk is secure and leaving fingerprints or DNA on the vehicle in case the officer is injured or the car suddenly speeds away. While dash cameras are now common, the practice has been used by officers for decades and continues to spark debate online.
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