"Whosoever shall unlawfully and maliciously administer to or cause to be administered to or taken by any other person any poison or other destructive or noxious thing, so as thereby to endanger life."
"Perhaps more relevantly the injection of heroin into himself by [the deceased] was itself an unlawful act, and if the appellant assisted in and wilfully encouraged that unlawful conduct, he would himself be acting unlawfully."
"We accept that there may be situations where a jury could find manslaughter in cases such as this, so long as they were satisfied so as to be sure that the chain of causation was not broken. That is not this case because causation here was not left to the jury."
"[We] accept Sir John Smith's criticisms of the reasoning in R v Kennedy: in so far as that reasoning was based on self-injection being an unlawful act, it was wrong."
"It was common ground between counsel that the crucial question at the heart of this appeal is whether the appellant's conduct was that of a principal: if so, he was guilty of both offences. If, on the other hand, his conduct was that of a secondary party, merely aiding the deceased, he could not be guilty of either offence, because no offence was committed by the deceased."
"A and B are joint principles where each does an act which is a cause of the actus reus; eg, each stabs P who dies from the combined effect of the wounds; or A and B together plant a bomb which goes off and kills P; but then each is liable for his own act, not because he has 'participated' in the acts of another; and each is liable to the extent of his own mens rea."
"there are two principals and two offences"
"... by applying and holding the tourniquet, the appellant was playing a part in the mechanics of the injection which caused death. It is therefore, as it seems to us, immaterial whether the deceased was committing a criminal offence. There is nothing in Dias which is inconsistent with this conclusion. Indeed, on the contrary, paragraph 25 of the judgment expressly envisages that, even where a victim injects himself, the supplier of the heroin may be guilty of manslaughter, provided causation is established. Edwards ... is to like effect. A fortiori, as it seems to us, a person who actively participates in the injection process commits the actus reus and can have no answer to an offence under section 23 or a charge of manslaughter if death results. Once the appellant is categorised as such a participant, it being common ground that death resulted from the injection, no question arises in relation to causation."
"So it seems to me that subject to one further point, to which I will turn almost immediately, cooking up heroin, loading it into a syringe, and then giving the syringe to someone who is clearly going to inject themselves almost immediately, is capable of coming within the terms of section 23. Whether or not it does so in any given case is a question of fact which falls for the court to the jury and not the court to decide. The last remaining point in relation to section 23 is this. In order to establish limb two of their case, the prosecution would have to prove that the defendant caused the heroin to be administered to, or be taken by, the deceased. In my view it is not necessary for the Crown to prove that the defendant's actions were the sole cause of the deceased injecting heroin. Here, by cooking up, loading the syringe, and handing it to the deceased, the defendant produced a situation in which the deceased could inject and in which an injection by her into herself was entirely forseeable. It was not a situation in which injection could be regarded as something extraordinary. That being the case, it seems to me that on the authority of Environment Agency v Empress Car Company Limited[1999] 2 AC 22 , that it would be open to the jury to conclude that the defendant's action caused heroin to be administered to, or to be taken by, the deceased. At the end of the day this is a question of fact for the jury to decide."
"Whether or not the defendant caused heroin to be administered to or taken by the deceased is a question of fact and degree which you have to decide, and you should decide it by applying your common sense and knowledge of the world to the facts that you find to be proved by the evidence. The prosecution do not have to show that what the defendant did or said was a sole cause of the injection of heroin into the deceased. Where the defendant has produced the situation in which there is the possibility for heroin to be administered to or taken by Jasmine Grosvenor, but the actual injection of heroin involves an act on part of another - in this case Jasmine herself - then if the injection of heroin is to be regarded in your view as a normal fact of life, in the situation proved by the evidence, then the act of the other person will not prevent the defendant's deeds or words being a cause, or one of the causes, of that injection. On the other hand, if in the situation proved by the evidence, injection is to be regarded as an extraordinary event, then it would be open to you to conclude that the defendant did not cause heroin to be administered to or taken by the deceased."