I don't know anything definitively one way or another, but it might be related to this. http://en.wikipedia.org/wiki/Freedom_of_movement_under_United_States_la

I don't know anything definitively one way or another, but it might be related to this. http://en.wikipedia.org/wiki/Freedom_of_movement_under_United_States_law http://en.wikipedia.org/wiki/Freedom_of_movement_under_Unite...