i kinda think contigous countries should honor each others credentials anyway.
Reasonable expectation, between countries with a good relationship as ours.
Language is the curve ball. I don't know of any States that issue drivers licenses only in Spanish, but if one did, I could see the LEOs up here scratching their heads over what they were looking at.
We need a little UNCommon Sense applied (in Canada). Don't hold your breath.
Rgds, D.