It is if you're a LEO. They can, and do, get away with pretty much anything they want when it comes to violating your rights. That's why you should never talk to them beyond "yes, sir", "no, sir", and "with all due respect, I don't talk to police officers". They aren't your friend trying to have a conversation with you - they are trying to get you to give a self-incriminating answer (or at least an answer that gives them probable cause to further violate your rights).