Late night patrolling is a part of the US police department. Checkpoint have been established at numerous places where the role of the officers is to check the drivers for their license and insurance cards and after general assessment allow them to proceed ahead.
What happened here in this video is that the guy had been filming the entire drive session from quite a distance, so the beginning of the video is quite static. As soon as he reaches the checkpoint and is asked for his credentials their sparks a general misunderstanding on which the respective officer loses his temper and the guy in return starts to generalize his constitutional rights.
It was the point where the office was acting right according to the law enforced with his badge and on the other hand the man believed that he was being threatened for no good reason. The officer however stated that we are here and we are entitled to check the driver’s license and the insurance and when Im asking you to present that you are supposed to give that to me. It appears to be a case of apparent misunderstanding between the two people.