alaska to be exact. that's right, a doping scandal has hit the iditarod. the 1,000-mile dog shred race. after some of the competitors tested positive for a banned substance. and not the mushers either. we're talking about the dogs. you would think if any athletes would be pure as the driven snow it would be these. but believe it or not, one of these competitors you're looking at right now could be the lance paw-strong of the sled race community. this scandal goes all the way to the top. four dogs on the team run by dallas sachlt eavy tested positive for high levels of tramadol which is a painkiller. he's won the iditarod four times. he posted this on youtube. >> i have done absolutely nothing wrong. i have spent the last ten years becoming the best musher i possibly can. i have done nothing wrong. i have never knowingly broken any race rule. i have never given any banned substance to my dogs. >> the video is about 18 minutes long. let's just say that he makes a very convincing case. his theory can be summed up by something the poets ad rock, mike d and the late great mca