It gets funnier when you consider the fact that the house that was used at Ricky Bobby's house in Talladega Nights was actually Kurt Busch's real life house (I think).
Unless the FBI investigators are psychics that can see into the future, I don't they will just be able to go "I think this Tamerlan guy will commit acts of terror against the US in the future. Let's lock him up."
Unless say Tamerlan said something odd, I don't think they could just do that.