Attorney-General for Northern Ireland v Gallagher

Where insanity is alleged, the accused must establish that, at the time of the act, a disease of the mind caused such a defect of reason that he did not know the nature and quality of his act or that it was wrong. Voluntary intoxication cannot convert a condition producing no more than loss of self-control into insanity. A jury may examine the accused’s earlier mental condition to determine the nature and continuity of the alleged disease, provided that the decisive cognitive questions are applied at the time of the act.

Once leave for a criminal appeal has been granted under section 1 of the Administration of Justice Act 1960, the House may decide issues beyond the certified point where necessary to dispose of the appeal.

The respondent was convicted of murdering his wife. He relied on insanity under the M’Naghten rules or, alternatively, intoxication so extreme that he could not form the intent required for murder. The medical evidence differed over whether his alleged aggressive psychopathy could do more than impair self-control during an explosive outburst.

The Court of Criminal Appeal of Northern Ireland held that the trial judge had misdirected the jury by directing attention to the respondent’s mental condition before he drank whisky. It set aside the conviction and, being unable to order a retrial or substitute an appropriate verdict, directed an acquittal. The Attorney-General appealed under the Administration of Justice Act 1960.

The House considered both the scope of an appeal following certification and whether the summing-up, read as a whole, correctly distinguished a defect caused by disease of the mind from the effects of voluntary intoxication.

1. Appeal allowed unanimously; conviction, verdict and sentence restored. Lord Reid, Lord Goddard, Lord Tucker, Lord Denning and Lord Morris of Borth-y-Gest each concluded that the murder conviction should stand.

2. Per Lord Reid, with Lord Goddard, Lord Tucker and Lord Denning expressing substantially corresponding views, section 1 of the Administration of Justice Act 1960 makes certification of a point of law of general public importance and the grant of leave conditions for an appeal. Once leave is granted, the House is not confined to answering the certified question or deciding matters consequential upon it. It may consider another issue where that is necessary to dispose of the appeal. Whether an appellant may insist upon arguing a wholly unrelated point was left open; Lord Tucker and Lord Denning emphasised the House’s control over such arguments.

3. Per Lord Tucker and Lord Morris, the governing issue of insanity remained whether, at the time of the killing, a disease of the mind caused a defect of reason through which the respondent did not know the nature and quality of his act or did not know that it was wrong. The accused bore the burden of establishing that his actions were manifestations of disease rather than intoxication.

4. Per Lord Tucker, the trial judge was entitled to direct the jury to consider the respondent’s mental condition before he drank. That inquiry identified the nature of the alleged pre-existing psychopathy: whether its explosive outbursts could destroy the relevant knowledge or merely impair self-control. Read as a whole, the summing-up repeatedly related the decisive questions about knowledge to the time of the killing. It therefore contained no misdirection. Lord Morris reached the same conclusion. Lord Reid agreed with Lord Tucker’s reasoning.

5. Lord Tucker explained that voluntary alcohol could not assist an insanity defence where the alleged disease itself produced no more than loss of control. This did not exclude insanity where excessive drinking produced a distinct disease of the mind, such as delirium tremens, which satisfied the M’Naghten rules. The present evidence disclosed no such alcohol-induced disease. Lord Goddard considered that there was no sufficient evidence of insanity and regarded the evidence as showing, at most, self-induced drunkenness.

6. Lord Denning additionally reasoned that a person who, while sane and sober, forms an uninterrupted intention to kill and then voluntarily becomes intoxicated before carrying it out cannot rely on the resulting defect of reason as insanity or as reducing murder to manslaughter. His formulation was an additional basis in his own speech rather than the narrow common ground of the House.

1. House of Lords: Allowed the Attorney-General’s appeal unanimously and restored the verdict, conviction and sentence for murder.

2. Court of Criminal Appeal of Northern Ireland: Allowed the respondent’s appeal for misdirection. As it considered that it could substitute neither manslaughter nor guilty but insane and could not order a retrial, it directed a verdict of acquittal. It certified a point of law of general public importance but refused leave to appeal.

3. Trial before the Lord Chief Justice of Northern Ireland and a jury: The respondent was convicted of murder after relying on insanity or, alternatively, intoxication negativing the intent required for murder.