Derek Moran
pg. 239...
DEFENCES (they give six...the top one?)
1. COMMON LAW defences: every rule and principle of the common law that renders any circumstance a justification or excuse for an act or a defence to a charge continues in force and applies in respect of proceedings for any Criminal Code offence or federal offence, except insofar as they are altered by or are inconsistent with the Criminal Code or any other federal Act (s.8(3))