Defences to rule 55(10)
56. It shall be a defence for an inmate charged with an offence under rule 55(10) 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.