Hinault never actually failed a test, but there is that one blot on his otherwise-clean record where he refused to pee in the cup at Callac. One of 5 who refused.
But LeMond is on record as saying that "everyone" on La Vie Claire, including the Badger, rode clean in the two years he was there. And considering that Koechli was an adamant anti-doper, and how Hinault personally approved him as DS, I tend to agree with Greg on that.