In addition to video surveillance, deputies are posted outside the barns to monitor all interactions with the horses and to collect used veterinarian supplies in sealed evidence bags pending post-race testing results.

WSJ: Vyjack's trainer puts his faith in jockey

The issue of drug tainted horse meat is more easily documented through the Thoroughbred Racing Industry due to the lip tattoos each Thoroughbred race horse is required to have, the post-race testing of the winner as well as some random testing as well as the public nature of horse racing.

FORBES: No American Horse Steak for You, Europeans

Tim Lee has an excellent post on charters and high-stakes testing at his blog (riffing off of another really good post from Aaron Swartz) which I found myself in turns agreeing and disagreeing with.

FORBES: High-Stakes Testing, Choice, and Bottom-up Education