HM Advocate v Ross was a 1991 Scots criminal law case decided by the High Court of Justiciary. The defendant had been charged with violently attacking others in a public house, but was allowed to go free on the premise that he was in a state of non-self-induced automatism. Others in the bar had slipped LSD and other drugs into his beer without him knowing, and there was only a small amount of alcohol he had been drinking so he was not responsible for his intoxication which led to the violent actions.