Why do cops handcuff you behind your back?
Why do cops handcuff you behind your back? Therefore, the arms are handcuffed in back so as to immobilize them, reduce the threat and make it difficult for the arrested person to run. It's not about comfort when taking away someone's freedom of movement, even if for a short time.
Why you should not let cops touch your tail lights?
Some police departments advise their officers not to touch the tail light, while others tell them to touch the side of the car and not the back. If the officer touched the tail light, they would be right behind the car. The officer could get hurt if the driver put the car in reverse.