Have you seen Mexico border? If not, then your idea is not workable!!! Once you see the mexico border you won't believe how huge the fence was, and no it is not by the foot! MILES MILES MILES MILES MILES!!!! Impossible to keep track of every feet! I already saw and dropped my jaw. Whats more some tunnels were caught! How many more tunnels exists today??? That is the HUGE problem! There are MILLIONS ways to get into United States, and unfortunately only 20% are patrolling.
Yes I saw patrols along the border, every 1/4 mile! But I know not all along have the patrol, they have to rotate. Anyway where I saw them? In El-Paso, Texas and I was about 500 feet from that broder! That is enough for me to see the reality.