Andy
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All US citizens, dual national or not, must use a US passport to depart the Western Hemisphere. (There's an unenforceable anomaly as regards Canadian citizens, but let that pass.)
As a practical matter, however, since it's the airlines that apply the law, a dual national can leave on the foreign passport and if his or her name is not in the airline computer s/he will be able to go to the other country. In any case, once s/he is 18 years old, the block expires, assuming the block is a matter of custody and family law.
The airline will notice that the traveling 17-year-old does not present an I-94, but will accept any old excuse. I have never known a traveler to be rejected for reason of using the wrong passport to exit the USA, although of course that's the law, and it could happen. But the traveler could go via Canada, and then there is no means of enforcing the block, or the Western Hemisphere rule.
One could always visit the public library (the Haskell Free Library and Opera House) in Derby Line, going in the front door from the USA and leaving via Rock Island, Quebec. |
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