Our fishing group has learned differences in the laws the hard way - a couple of guys were stopped at the border and had their backgrounds checked. Both were denied entry because they had misdemeanor crimes (OWI)on their record. OWI is a felony in Canada and felons are not admitted without jumping through a few hoops. One guy has spent considerable time and money trying to get paperwork cleared so he can come fishing with us again.
This is pretty much common knowledge that people with DWI's are not allowed in. I don't blame them either, if you're irresponsible enough to drink and drive I wouldn't want them in my country either.
