There is a better ,cheaper way that we have used in the past and in 65 years very few have risked crossing. It is not impressive to see but one miss step and the next person will think long and hard before trying .
Now I know it would out rage a lot of folks but in a few years not many would think of crossing the boarder except legally . The loss to the drug cartels would be huge and our expense would be a fraction of the wall. If we used mines we wouldn't even have to do the whole border . A few put out here and there it would be bluff in some area,s . Just something to think about that works.