US Customs are great. Sometimes they almost think about opening your trunk and looking inside. Sample conversation at the San Ysidro Port of Entry aka TJ:
Customs: Citizenship?
Me: US.
Customs: How long have you been in Mexico?
Me: Three days.
Customs: Anything to delare?
Me: No.
Customs: Go ahead.
Me talking to my friend: Dude, there 1,800 boxes of Clenbuterol in the trunk.
Dude: Ya I know.
