The person at DoD would have been arrested.
"I have a question, if DOD had given the FBI the information on M. Atta, before 9/11, what would have happened? Would he have been arrested, picked up, questioned, sent back to Saudi Arabia?
The person at DoD would have been arrested."
Well, I'm not sure. That would be the intention of the DoD maybe. But once the info got to the FBI, things might have taken on a life of their own, protecting the leaker. Probably not, though.