We bought tires in Florida for all 5 races at both tracks from 2 different tire vendors. We were tested and came up negative for any solvent or doping solutions. It's the easiest way to do it. (Buy at the track)! We all know people dope tires and we no it won't stop. Just some of us choose not to. I don't see the big surprise about this. If you cured a tire and you know your going to be checked and your running 3rd you better fall back a few spots. I don't get it.