Here's Why Police Officers Tap Your Tail Light When You're Pulled Over
Why Cops Touch Your Tail Light During Traffic Stops | Reader's Digest
Why Does a Policeman Touch a Tail Light? | Legal Beagle
The Reason Cops Touch Your Car's Taillight When Pulling You Over | To leave fingerprints, as proof that they pulled you over in case you decide to flee : r/savedyouaclick
Why do police touch the back of your car when they pull you over? | The US Sun
Why Do Police Touch Your Car? Is It a Habit or a Necessity? » Way Blog