Ross v HM Advocate 1991 JC 210 is a leading Scots criminal case that concerns automatism as defence.[1][2] The High Court of Justiciary clarified the rules for an accused to successfully argue automatism as a defence to a criminal charge.[3]
Ross had been drinking beer from a can. Without his knowledge, five or six tablets of temazepam and some of LSD was put into his can. He ended up consuming the drugs alongside the beer. Thirty minutes after having consumed the drink, he started screaming and indiscriminately attacking other people with a knife. Several people were severely injured. Ross resisted arrest by the police and stopped screaming only after they had handcuffed him. He continued to struggle until he was taken to a hospital and administered a sedative drug.[4]
The High Court at Glasgow tried Ross for various charges including nine counts of assault and seven counts of attempted murder. The jury found Ross guilty on several of the charges but found that while he committed the offences, he had been influenced by the drugs that were administered to him without his knowledge. He has appealed against his conviction on the ground that the trial judge misdirected the jury that they could not acquit him of the charges of which he was convicted.[4]
Ross appealed the decision to the Court of Criminal Appeal. He argued that the trial judge had misdirected the jury by telling them that they could not acquit Ross of the offences, in spite of his involuntary intoxication.[4]
A five-judge bench of the Appeal Court upheld Ross' appeal[4] and set a precedent for successfully using automatism as a defence in Scots criminal law.[3] The Lord Justice-General Hope identified three requirements for automatism:[3]
Later cases suggested that the Scottish precedent established in Ross would be followed in England as well.[5]