Montreal is by far the WORST city to deal with Canada Customs in. I've been told that after completing training in Rigaud, Quebec, their first assignment is commonly Dorval. So they're a little more militant and by the book when it comes to collecting duties.

The only times I have been searched or made to pay duties is in Montreal. In Toronto, I ocaasionally bring in more than my limit but I always declare and am waved through and sometimes thanked for my honesty in declaring.