Yeager remember that you need a warrant to use the evidence in court.
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Indeed! Still, when it comes to preventing an attack using presumably, weapons of mass destruction, I dont care about courts, but you are indeed correct.
I recently read a book on J. Robert Oppeheimer and you would not believe the garbage Hoover did to the guy with illegal phone taps and illegal collection of evidence. They could have cared less about the legality of it, they just wanted dirt to destroy the man.
Im currently reading the 9/11 committee report and they are going into great detail about how the intelligence gathering agencies were totally screwed pre 9/11 due to FISA. Im still trying to put all that together. A real legal spiderweb that mess was/is.