Originally Posted by studentff

Honestly it's not something I'd worry about much, and that's coming from someone with a deep dislike for TSA.

The only way they're going to open a sealed envelope with nothing but paper in it is if you get selected for a full retaliatory screening, e.g., the kind where they pull out every card in your wallet and ask you about it, question you about your diet pills, and accuse you of embezzling money from your spouse by carrying checks made out to two people. (google "kathy parker tsa" for details) But those types of screenings are extremely rare and not something you're likely to encounter unless you are already deemed "suspicious" for some reason (e.g., you refuse to show ID, are carrying Arabic flash cards, are extremely late for your flight, look "nervous" or "look middle eastern" ). I've never encountered such a screening, though I know a few people who have, and I've read about a larger number of people. TSA, of course, will deny that such screenings are retaliatory, but we all know better.