They can't just arrest you for questioning. What they can do is to invite you in for question.
please state your name where were you at??:?? pm/am? what did you do on the day of ??/??/??
No. The arrest is not likely to be reported, but if you were fingerprinted, a copy of them will end up in the FBI database.
Yes, the police can request you to come in for questioning, but you have the right to refuse unless they have a warrant for your arrest.
Circumstantial evidence is definitely enough to arrest someone - a person is arrested not just for questioning, but also to preserve other evidence, like forensics. Circumstantial evidence might not be enough for actual charges to be made, but the arrest might yield more concrete evidence.
The FBI does arrest individuals. They arrest people charged with federal crimes. They have the choice to question the individual in a local police department or at their own offices if that is a viable choice.
yes
Usually includes routine FBI.
yes
they stake out in front of the persons house and see if they are really selling drugs and if they are they go into the house and arrest them
i think tha FBI chack is for see if someone is an FBI agent...
Hell yeah. They can arrest the president if the circumstances are legitimate.
The job of FBI agents is to investigate actual or suspected violations of federal law, and to arrest criminals whom they identify in the course of their investigations.