THEY LET THEM GO!!!!!!!!!!!!!!!!!
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They probably got a call from El Hefe Presidente Jorge...
Thanks for outing yourself quickly. There's a general rule of thumb that anyone who refers to President Bush as 'Jorge' is a blowhard idiot.
Yup, being that close to the border it's doubtful ICE would just let them go arbitrarily, they most likely got a call from some open borders higher up.