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One week ago, 376 Central American migrants, mostly youth and children, dug several tunnels under the wall in Arizona, entered the United States and surrendered to border authorities. How many drones could we put out and monitor for border protection for several billion dollars?
A wall is impractical and causes a dreadful environmental impact. If we want to see who is coming across the vast open areas of approach to America from the south, drones certainly appear to me to be more effective, cheaper and much more practical than walls that are quickly scaled and tunneled.