Why do officers touch the back of a vehicle during a traffic stop?

During a traffic stop, officers touch the back of a vehicle primarily to leave fingerprints and to check if the trunk is closed. This practice serves a few critical purposes. By touching the vehicle, officers can physically document their interaction with it, which may be useful for establishing a timeline or for evidence collection later in case of any disputes regarding the stop or any subsequent events that occur.

Additionally, officers check to see if the trunk is closed because an open trunk can pose a potential safety risk. It may suggest that the driver or any passengers could be concealing weapons, contraband, or stolen goods. Ensuring the trunk is closed also helps maintain the security of the vehicle and protects the officer from unexpected surprises, which can be vital in maintaining safety during a traffic stop. This practice is an important part of the protocol and contributes to overall officer and public safety.