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Unmanned Aerial Vehicles are great technology, but a small piece of the overall border defense puzzle. For the size of the Southern Borders, we need lots of human boots on the ground. A few UAVs flying around, and the small number of Border Patrol simple doesn't cut the mustard!
Face it, what we have now is woefully deficient, backward, and archaic. The whole system of protecting, apprehension, temporary incarceration, and deportation needs an extreme overhaul. Will we ever get it the whole taco, I have my doubts.