People often wonder why police officers touch the tail light of a vehicle when they are pulled over. Why do cops do that? Obviously, everyone hates being pulled over by a cop but they are just implementing traffic laws.
Police officers touch the tail light of the vehicles in order to leave their fingerprints on it. This is taken as an evidence. In case the officer finds himself in a threatening situation, fingerprint evidence would prove that he was present at the scene.
To provide shock or surprise to the person sitting inside the vehicle. This practice proved to increase in the arrest of criminals, drug peddlers and people with unlicensed firearms.
Source: South Tips
Most police officers these days are equipped with cameras, so it’s not necessary to leave fingerprints all over the place. Plus, car washes have become just as popular as dashboard cameras.
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