Im still entirely freaked out by that dude who was caught doping, and then came up with a major story where his gf traveled somewhere, got sick, visited some shady doctor who prescribed her some shady unlabeled meds, which she kept taking even when she came back to usa. And then those meds had the doping thing, so it got into his body while they were making out. The dude got away with that.
The TUEs have another issue - because people may say "well, russians could just TUE too why not". The med system of Soviet Union and now Russia has its own development, and there are many meds that undergone clinical tests in russia, with results being published in russian in russian journals. There is a major lack of knowledge about those in the west, and it is fairly impossible to get a TUE for one of those, even though they are entirely and perfectly valid medicine. See meldonium for example.