Miranda Rights
It seems that action movie writers simply don't have access to the right study materials when it comes to police procedures. Consider Miranda rights, which is one of the most pervasive fallacies about the police in American-set films. Many people believe that in order for an arrest to be legal, police officers must read you your rights first. These rights are typically something along the lines of "you have a right to remain silent" and other similar phrases.
Anyone who has ever been detained anywhere in the USA would undoubtedly inform you that this is untrue. Although they are required to tell you your Miranda rights before they begin the process (called after the notorious Miranda v. Arizona case from 1966), this normally happens at some point during the interview. Police officers have the authority to detain you if they believe you are engaging in illegal activity without even speaking to you, as they frequently do.