Yeah, he basically has to prove that something was tainted... which can happen. Some guys on the Mexican national team got suspended at one point and were able to prove it was tainted beef at a restaurant. But the most common defense is that an over the counter supplement had something in it that wasn't on the label... and that one has never worked for a player. The MLB has an approved supplements list for a reason. That was 7 players from the Mexican National Team that allegedly ate chicken tainted with Clembuterol. They were all suspended from the Gold Cup pending their appeal. The WADA didn't ban them for the longer length of time because the poultry industry in Mexico is notorious for having issues with chicken. That said, in that case, it's highly unlikely that those guys weren't doping. They happened to have their entire country being willing to take a hit on their behalf. That's not going to happen to Braun. Not only are MLB's rules far more strict in terms of appeal, but I doubt there's any realistic scenario where he wouldn't be held accountable for what goes into his body. Basically, unless a hooker shot him up with steroids while he was unconscious, he's going to serve this suspension. Which sucks for baseball, the Brewers, and Braun.