Quote Originally Posted by Steve Smith View Post
Technically there is no arrest for something which is not illegal. You can be arrested for something you didn't do but were suspected of doing but not arrested for something which you cannot be arrested for!

When you are arrested you must be told the reason why and if that reason is not valid, it is not an arrest (or it's a wrongful arrest).

Actually, anytime a police officer stops you to talk to you in his official capacity you are "under arrest", including being talked to about things such as being a witness to a crime. If he takes you into custody that's a different story.