B agreed to sell heroin to an undercover RCMP officer. Defence was that H had told him it wasn’t heroin
True crimes we need proof of subjective MR.
Mistake of fact is the denial of MR for the defence – it is not a defence it is just not having the requisite MR to make up the offence.
Was a reasonable defence – he was told it was something else – however that mistake did not negate the MR for the trafficking offence