Quoting a Homeland Security site info gives one the official
version, what happens at the US Border coming back is
another matter. You can readily cross back with a DL, birth
cert or no ID. The idea of being in US Customs secondary
for hrs. because one doesn't have a valid passport does
not happen, there are crossers who routinely come back
with a DL, being legal re: getting a Mex Tourist card which
is officially required is a different matter, but if every tourist driving
into Mex stopped for a tourist card at TJ, Hwy 5 would be backed up to dowtown SD
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