I have Quebec`s casino games law in front of me and there is absolutely nothing in it that says that it`s illegal to count cards at blackjack. Also keep in mind that casinos in Canada (at least the ones in Quebec anyway) are state-owned and they have to respect the charter of rights ; they just can`t discriminate and kick someone out unless that person breaks the law.
I`ve only heard of one case of a pro blackjack player who was denied entry... I think he sued the casino after that (and won a few K`s with the lawsuit