Mich. Admin. Code R. 285.815.13
Rule 13. Saliva and urine samples may be obtained by the director from any horse entered in a registered light horse race. The director or his representative may request the fair association to furnish necessary help to obtain saliva and urine samples. The department will pay the help at pre-established rates. Failure to provide sufficient help when requested shall result in forfeiture of all rights to state aid to the fair for these contests. The owner, trainer, groom, or other responsible representative of the owner shall be present when a saliva or urine specimen is taken from the animal, and shall remain until the sample is sealed in his presence. The official sample tag attached to the specimen shall be signed by the owner, trainer, groom, or other representative, as witness of the taking of the specimen. Refusal or failure to sign the sample tag will in no way affect the validity of the specimen. Willful failure to be present at or refusal to allow the taking of a specimen, or any act or threat to impede or prevent or otherwise interfere therewith, is a violation of these rules. The saliva and urine samples shall be analyzed in the laboratories of the department. The presence of a drug in the chemical analysis of saliva or urine samples shall be prima facie evidence that the drug has been administered to the animal.
Mich. Admin. Code R. 285.815.13