Defences to rule 51(9)
52. It shall be a defence for a prisoner charged with an offence under rule 51(9) to show that:
(a)the controlled drug had been, prior to its administration, lawfully in his possession for his use or was administered to him in the course of a lawful supply of the drug to him by another person;
(b)the controlled drug was administered by or to him in circumstances in which he did not know and had no reason to suspect that such a drug was being administered; or
(c)the controlled drug was administered by or to him under duress or to him without his consent in circumstances where it was not reasonable for him to have resisted.