The new Homeland Security warning system includes 18% gray.

“Annoying the TSA is not a crime,” the blog post states.

http://www.dhs.gov/files/programs/ntas.shtm

“Photography is not a crime.

You have the right to fly without ID, and to photograph, film, and record what happens.”

http://www.theregister.co.uk/2011/01/25/passenger_acquitted/