In my last column, I touched on the fact that much of the government was still shutdown due to the impasse over border wall funding. Truly, I thought that it would all be resolved by now. But with no end in sight, I wanted to talk about using technology--specifically artificial intelligence and drones--to create an impenetrable defense along our borders that would be mostly invisible and yet highly effective. Much of the technology needed to support such an endeavor already exists today, and such a system might just be acceptable to both sides of the great wall debate. First off, it's important to mention that walls by themselves have never been effective at stopping humans from moving through, over, under or around them.