Harassment might be luck of the draw. 
 
About 5 years ago, crossed S. at San Ysidro, got a red light, pulled over.    Directed to an x-ray machine, and ordered out.    Wife and I asked to
wait in a walled concrete area.    They x-rayed my car 3 times, then asked to drive to an inspection area.     Sat on the curb for 1/2 hour before 3
MX came over and asked us to unpack the car.    They were esp. interested in the 2 bottles of wine and 6-pack of beer I had.     Placed alcohol on
curb and photographed it.    Then they disappeared. 
 
Started walking around asking if I could leave and was told to wait.     1.5 hrs later swore I'd never go through there again. 
 
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