Sure the contract was let months back to build a total of nine towers, deploy by July 2007. Provided you actually had people watches the cameras, border agents in the field to apprehend ... it might do some good. No where near what a real secure fence would do, as the border can still be rushed and overwhelm the responders. It also depends on the wathcers not getting tired and turning it off for the day.
Build the real fence use the toys for surveillance of the real fence.
Exactly. With a real fence, they could get by with a string of ultracheap motion detectors that would go off if anyone walks or drives up to the fence.