Can a US carrier contract Canadian O/O ?

for what?

 

Shouldn't be an issue so long as you don't load him with any US to US loads...aka abide by cabotage law and you should be good to go

 

I agree with GoKid's answer. Google cabotage. I believe you'll find lack of US citizenship will prohibit the driver from legally hauling trailers from a US pickup to a US destination. Unless you can get the driver a work permit.

 

Yes, you can. I am a Canadian, living in Alberta and had my truck leased to a Montana-based carrier (owned by Canadians--I know, it gets confusing). In that circumstance we did a trip-lease each week. I don't know if that was the only way to make it work or not.

 

Do you have Canadian authority?

 

I don't see why you couldn't contract a Canadian carrier. Then it would probably fall on the carrier to comply with the cabotage rules.