(defendant disqualified plaintiff's grand champion steer from county fair which required forfeiture of all awards and prizes; disqualification a result of presence of flunixin (Benamine) in steer's urine sample; defendant claimed that it need not prove how the drug was introduced into the steer, and plaintiff's denied any knowledge of how drug introduced into steer; provisions of state administrative code that plaintiff's cited for violating required defendant to prove that plaintiff's took some action that caused drug to be introduced into steer; while separate provision of administrative code allowed defendant to find plaintiff liable without any evidence of plaintiff's conduct, that provision not contained in notice of hearing given to plaintiff; trial court reversed defendant's order; on appeal, court affirmed).