Quote Originally Posted by Turnup View Post
...It seems to me that in many areas the police will issue a request in such a way as to give the impression that they are issuing an instruction. It can be quite difficult to ascertain from them which it is in a non-confrontational way, and most people are unwilling to be directly challenging (which is why such requests are made in the first place)...
This^^.

If in doubt, ask if they're exercising a power and, if so, which one.

If not, then your participation is strictly voluntary.