They seem to be getting on little single-engine wood boats 20 at a time and heading up from Tijuana to LA. Hard to spot, too, according to the folks who are looking for them.Fewer problems with coyotes, but costs illegals twice as much. A single boat can make $100,000 for each boatload successfully delivered. Or maybe even if not so successfully delivered.
So now we have a fence, but these folks are treating it like the Maginot Line.
Low-tech, but effective. They just don't play fair! :-)