The corruption of Mexican public officials is notorious. A simple border will not stop it. You 'ain't seen nothin yet!'This corruption case is the reality of "The Big Tent," "Room at the Table," "Our Diversity is Our Strength!"
If you were a smart drug lord and had to smuggle large quantities of drugs across a border, wouldn't one of the smartest things you could do be to corrupt local and US officials? Maybe even finance them into elected office or get your people into place in the Customs.
Lead or silver? They know it works.