can someone drive across the border from the US, stay for 6 months, go back the US for one day, then return for 6 months? at the border the passports are not stamped, there is no record of the date of entry. I don't want my mother to do something illegal, it just seems it would be so much easier for her to do this than to go through the Super Visa application. I would still have her purchase medical insurance, though.