Guard towers every 500 meters or so with robot controlled .50cals, Infrared targeting...anything that moves gets lead poisoning. After a while the piles and stench will make it clear...NO TRESPASSING!
We do not kill unarmed civilians, including illegal immigrants, neither by bullets nor by electrocution nor by any other means. We live in the United States of America and not in the old Soviet Union. Herman Cain the TALKER throwing more stupid red meat bumper sticker rhetoric to the Red Meat crowds who are very close to be called the Crazies.