[QUOTE=SCI;8459729]
I did quite a bit a research because I know of a horse that tested positive for theophylline who had not been intentionally drugged. I can tell you that theophylline (caffeine found in tea) and theobromine (caffeine found in coffee) are both common contaminants in horse feed because the same tanker trucks that haul grain products (oats, corn, etc) also commonly haul coffee beans and other products. It is so common, that there are acceptable levels for the FEI and horse racing. There arenāt acceptable levels for USEF for theophylline (only theobromine). Theophylline is also found in most species of holly bushes/trees. We think that is how my friendās horse had it in his system since there are holly bushes all around his farm and the horse is always grabbing a mouthful.[/QUOTE]
Thatās interesting to learn, thank you!