This has become an issue in the last couple of years in mushing - and only because the media has pushed for it (because a certain four time iditarod champ tokes up regularly). They've tested the dogs for years (they tie a ziplock bag to their parts to get the urine... it's so weird looking) but now they're also testing the mushers for certain drugs (recreational and performance enhancing) but I don't think their list of no no drugs is as long as olympic athletes. One of the mushers got busted this year, he wasn't top 20, but it definitely saw a lot of upset fans... I mean how stupid do you have to be?!