The design is strong - with steel, rebar and concrete poured inside - but the problem is drug dealers can easily pass drugs through the wall. No more having to toss the stuff over - just small packet it through the bars.
Trump’s idea of concrete was better... put a path on the top with guard towers and it would have worked better and longer.
As Trump recently said, the bollard wall design was preferred by the border patrol. So was the system of one shorter bollard wall, a strip of land, then the 30’ wall.
No one is passing anything through that.