Police have every right to question someone.
If someone talks about blowing something up and then buys bomb making materials the police have a case. Otherwise it is just talk.
If someone talks about removing someones head it is pretty darn hard to make a case that they were actually going to do it. If questioning him pushed his buttons enough to act on his intentions well good for the police.
Yes, police have every right to question someone.
If Rahim was so dangerous, why didnt the constant surveillance result in any charges? If as the media spent all day claiming he was on the verge of executing a horrific terror attack, why didnt law enforcement agents have an arrest warrant or even search warrant?
This method doesn’t match up with how the FBI conducts business with someone this “dangerous”