Which aspect is NOT necessary for establishing an arrest?

To determine whether an arrest is valid, certain key elements must be present. Authority refers to the legal power a law enforcement officer has to make an arrest, which is essential for the action to be recognized under the law. Seizure is the actual taking of the person into custody, which is a critical part of the arrest process.

Understanding can also relate to the suspect being informed of the reasons for the arrest and their rights, which is part of ensuring due process. However, cooperation from the suspect is not a requirement for an arrest to take place. An officer can legally arrest an individual regardless of whether the suspect cooperates. Therefore, while cooperation may make the arrest process smoother, it is not necessary for the establishment of a legal arrest.