Hello! I'm a former TSA supervisor who worked at TSA in a mid-sized airport from 2006–2012. Before being a supervisor, I was a TSO, a lead, and a behavior detection officer, and I was part of a national employee council, so my knowledge of TSA policies is pretty decent. AMA!
Caveat: There are certain questions (involving "sensitive security information") that I can't answer, since I signed a document saying I could be sued for doing so. Most of my answers on procedure will involve publicly-available sources, when possible. That being said, questions about my experiences and crazy things I've found are fair game.
edit: Almost 3000 comments! I can't keep up! I've got some work to do, but I'll be back tomorrow and I'll be playing catch-up throughout the night. Thanks!
edit 2: So, thanks for all the questions. I think I'm done with being accused of protecting the decisions of an organization I no longer work for and had no part in formulating, as well as the various, witty comments that I should go kill/fuck/shame myself. Hopefully, everybody got a chance to let out all their pent-up rage and frustration for a bit, and I'm happy to have been a part of that. Time to get a new reddit account.