It is in the name, after all

from here

Getting accosted by security just before boarding a plane seems ridiculous to me, Security had their chance to find a problem with the guy at the security checkpoint. If someone has gotten past the checkpoint without a problem they shouldn't be subjected to additional checks. That seems like the TSA version of double jeopardy.

(And a big shout out to the brainiac who reports this image macro whenever they see it because they feel it's inherently a death threat)