No it isn't, it is called free speech.
100% illegal to impersonate an officer of the law to illegally obtain information
Celebrity impersonation is not illegal unless it is intended to cause harm. Same goes with anyone else you impersonate.
No, of course not.
Alabama
That could be a very poor idea, and possibly illegal. So don't.
impersonate
Yes, it is illegal to impersonate another being for gain. This is fraud.
What is the source of your belief that a girl "can't" impersonate Boy George in the UK? Is it a legal question or a social question?
Yes, it is illegal to impersonate a veteran or having received awards or training for gain of any sort. Look for information on the Stolen Valor Act recently passed and signed into law.
The act of sniffing glue is not illegal in the UK but it is illegal to buy or sell glue for such a purpose.
It's really illegal to convey you are something that you are not. It is illegal to impersonate a police officer, a doctor, or a firefighter. Pretending to be a prisoner is not likely to be illegal. However, you can cause some pretty big confusion if the police were to see you wearing a prison jumpsuit. Most likely you would be arrested on the suspicion you are an escaped prisoner. But once you were to explain what you were doing, the police would probably check you and run a background check and if you checked out, they would let you go. And probably reccomend you take off the prisoner outfit. It's kind of a stupid idea to impersonate a prisoner when you think about it. Why WOULD you want to, anyways?