It has come to the Canadian Pari-Mutuel Agency's (CPMA) attention that the legitimate use of human prescription drugs by people handling racehorses can be a source of drug exposure for the horses that could, consequently, result in a positive drug test.
Human urine is a proven source of drug exposure for racehorses. And although not proven at this time, exposure could also be to drugs directly, through human saliva or via unwashed hands. In the interest of accuracy and to reduce unintended positive drug tests, the CPMA therefore strongly discourages people from urinating or spitting in horse stalls, and recommends that all people who handle racehorses wash their hands immediately after contact with, or consumption of, medications, and avoid bringing human prescription medications into barns whenever possible.
Canadian Pari-Mutuel Agency