why is it when i cross the border and walk back thru customs the BPAs wave any obvious mexican or foreigners thru no questions asked but yet when i get up there IM questioned about MY citizenship and where I was born by a guy fresh off the boat from someplace else? and why am i 1 of 6 people in that line who speaks english and is treated like a foreigner entering my own country? and what is a unit anyway?lol.~RG