Caffeine - a popular stimulant for many years but easily detected by modern methods.
It's present in chocolate and if you feed a horse a vending pack of M&Ms every day for 8 days, like researchers at Ohio State University did, there will be detectable concentrations of the drug in the horse's system.
It's present in chocolate and if you feed a horse a vending pack of M&Ms every day for 8 days, like researchers at Ohio State University did, there will be detectable concentrations of the drug in the horse's system.




