Blef
Verified Criminologist
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A letter of that type is required for taking children into Canada -- or was several years ago. We saw that while following the murder of Nancy Cooper -- she wanted to leave her husband (later, convicted murderer Brad Cooper). She had planned to leave Brad and to take her two girls to Canada, her home country, but she knew Brad would never give her that letter, so she had to stay here in the US until she died from strangulation.
https://www.websleuths.com/forums/showthread.php?141579-Verdict-Watch
There are parts of the Canadian/US border where you can get straight across as they are unguarded. I'm also sure that it's likely that they would forge a letter of consent to take her across the border at a crosspoint. I think it is more likely that if they have left the US then they are in Canada rather than Mexico.