R v Lipman [1970] 1 QB 152

Lipman took LSD and experienced hallucinations while with his girlfriend. During the episode he attacked her, causing her death. He said that he believed he was fighting imaginary creatures rather than acting against another person. He was convicted of manslaughter and appealed, relying on the effect of the drug on his awareness and control. The case required the court to distinguish the mental element of murder from liability for an unlawful killing arising from violence committed after voluntary intoxication. The asserted hallucinations did not mean that the death itself was accidental in a legally decisive sense.

Could self-induced intoxication that prevented proof of the specific intent for murder also exclude liability for unlawful-act manslaughter arising from the defendant's violent conduct?

The Court of Appeal dismissed the appeal against the manslaughter conviction. The absence of proof of the intention required for murder did not mean that the defendant was free from criminal responsibility for the killing. The violence supplied the basis for unlawful-act manslaughter, and the self-induced intoxication could not be used in the same way to defeat that offence. The court therefore distinguished the mental requirements of the two offences rather than treating intoxication as a complete excuse. The result should not be expanded into a claim that any death occurring after drug use constitutes manslaughter: the elements of the underlying unlawful act and its causal connection remain important.

Voluntary intoxication may prevent proof of the specific intent required for murder without excluding unlawful-act manslaughter. The effect of intoxication must be assessed against the elements and classification of the particular offence, rather than treated as a general exemption from responsibility.

The case illustrates how one factual episode can require different analyses for murder and manslaughter. It is particularly useful when a defendant claims a drug-induced hallucination: students should identify the charged offence, examine its mental element, and consider any supported alternative. It should be distinguished from involuntary intoxication and other causes of automatism. Calling unlawful-act manslaughter a specific-intent offence would obscure the reason the appeal failed and confuse the distinction the court was drawing.