What about when a driver does the loading and he is paid extra to do so? Won't this be considered as working in US?
Loading and unloading to and from the shipper's or receiver's docks technically does count as working in the U.S. and the Canadian driver would need a work visa or green card to do that. Check out the Laguardia Act ... it spells it out pretty clearly.
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Michael, post a link please. I looked up "Laguardia Act" and found only Norris-Laguardia.