I thought terrorism was a law enforcement problem, not a military one.
Well, I'm no lawyer, but I think posse comitatus deals with military activity used as law enforcement for any reason. But I'm not sure if that applies for use against US citizens or activity taking place on US soil. In any case, it shouldn't have been a problem for the FBI. There was no reason not to give the info to them, especially since it was all open source info on foreigners.
Law enforcement is a local issue.. Mexican insurgents are are an international problem.. Mexican illegal insurgents are in every state and most countys. A problem created and exaserbated by the federal gov't.. ON PURPOSE...