Remember Brandon Mayfield?
He's the guy whose fingerprints the FBI found on the detonators near the scene of the Madrid train bombing (except oooopps they weren't his prints).
Mayfield has become a valuable object lesson in more than just the loosey-goosey quasi-science of fingerprint matching.
(My Slate piece on the subject is here)
As it turns out, after a sleazy try at dodging the question, Alberto Gonzales admitted that the government had used the PATRIOT Act against Mayfield. Let's just take a minute to really think about that. After swearing up and down that this was just gonna be used to nab the bad guys, we already have an admission that the government has used a sneak and peak warrant against an innocent American Citizen.