Sure - I just don't know that stuff. I don't even know what applies to you crossing and coming back. Just that he should be fine with his expired pr card and other docs you have.He will only need an antigen test to fly to the States but PCR within 72 hours of arriving in Canada. That, too, is covered. Just need to make sure I can get into Buffalo and cross him back to the border within that 72 hour period of his PCR test in Mexico.