[Hotmetal]

I would expect that he was coming to the U.S. because you are not checked on the U.S. side when going to Mexico by U.S customs but you might be checked on the Mexican side. I lived on the border for 5 years and was only checked one time by U.S. officials when I was going to Mexico and that was at a roadblock on the bridge and they were looking for someone. When leaving Mexico you are not checked on their side but could be checked on this side.

[La Lydia]

No. You are wrong. For a year now, CBP has been ordered to check for weapons going INTO Mexico. It is annoying to me that manpower which should be used to stop illegals and drugs coming into our country is used to secure Mexico.
http://www.dhs.gov/ynews/speeches/sp_1248440471735.shtm

And the guy was going INTO Mexico.
http://apostille.us/news/cbp_stops_machine_guns_ammunition_headed_into_mexico_from_california.shtml

[c-b 1]

He was going from the U.S. into Mexico, DHS has been checking cars going into Mexico at the border for about a year.