Not an accident: Horse dies of a heart attack in the performance ring? Tested for drugs? No? Why not?

Barrel racing horse dies from a heart attack in the ring, crushes young rider (never recovers from her injuries)

http://thehorseaholic.com/horse-suffers-heart-attack-and-young-girl-is-trapped-underneath-prayers-needed-for-kalee-chandler/#


http://shameinthehorseshowring.blogspot.com/2009/02/drugging-its-not-just-for-racehorses.html