2005 Arizona Revised Statutes - Revised Statutes §12-711  Affirmative defense; limitation

In any civil action, the finder of fact may find the defendant not liable if the defendant proves that the claimant was under the influence of an intoxicating liquor or a drug and as a result of that influence the claimant was at least fifty per cent responsible for the accident or event that caused the claimant's harm.