Here's the report on his acquittal (see also Seattle Weekly's report) The TSA Blog unsuccessfully spins the acquittal, as you can see from the numerous comments. And check out the Q&A on this site, which points out:
Is there any law that requires you to show ID credentials to fly, or to the police?
No. In Gilmore v. Gonzales (decided at 435 F.3d 1125), a case involving the same airline, lawyers for the TSA swore to the 9th Circuit US Court of Appeals that no Federal law or regulation requires airline passengers to show any evidence of their ID in order to fly.
Is there any law that requires you to answer questions from the TSA or police?
No. You have the right to remain silent. Mr. Mocek explicitly invoked this right.
Is there any law or regulation that prohibits or restricts photography or audio or video recording at TSA checkpoints or of police?
No. Prior to his flight out of ABQ, Mr. Mocek received written confirmation from Albuquerque TSA staff that, “There aren’t any state or city laws/ordinances that prohibit photography in the public areas of the airport.”