They probably don't have to for most mail. I posted this yesterday in the Jimmy Carter's mail discussion thread. tl;dr It isn't difficult (at least in principle

They probably don't have to for most mail. I posted this yesterday in the Jimmy Carter's mail discussion thread. tl;dr It isn't difficult (at least in principle) to read mail through the envelope. https://news.ycombinator.com/item?id=7456157 https://news.ycombinator.com/item?id=7456157