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Sheer numbers. The number of vehicles crossing at any given checkpoint requires that the border patrol only inspect some of them (not even minor checking like opening the glove box). For every person caught, probably a dozen or more get through.
Of course some vehicles are spotted as potential problems - such as a suburban weighted down so much the wheels are rubbing in the wells - but there are ways to stay less suspicious too - like putting 2x4's to prop that same suburban up off the wheel wells.
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