For those of you gringos that think that because you are a United States Citizens you are automatically alawed to enter back from Mexico, you will be stoped and checked very thorough and that can take several hours, unless you are in AFIS that will stil be time consuming, those days are gone, after 9-11 everything changed, do have one of the following documents a passport, bith certificate, border crossing card or the new drivers license otherwise be prepared for a rather uncomfortable questioning by CBP, guaranteed coutesy of Homeland Security!
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