Pushpanathan v. Canada asked the question of whether it is an error of law for the Refugee Division to interpret Art. 1F(c) of the Convention to exclude from refugee status an individual guilty of a serious narcotics offence committed in Canada.
Read about this case here:
http://www.canlii.org/en/ca/scc/doc/1998/1998canlii778/1998canlii778.html