They won’t have any problem ... just a short delay since most of the border with that fence is unmanned.
With today’s technology does every last foot of the border have to have someone standing there waiting for someone to approach the fence.
Is it not possible that we have aircraft (and drones) that can fly over the desert and perhaps “see” people at which point agents can be directed to intercept?
Just saying, we do not know everything going on.
every where there is a real barrier there has to be people on the ground watching/paroling - tech can be defeated often in the simplest ways. Drones can be jammed, aircraft can only monitor the area they are f;lying in - once past a given point the cost is clear until the next pass - and those passes an be timed by crossers.
Not every last foot - a patrol can watch miles over flat cleared ground. If we don’t know everything that is going on, you can bet the coyotes and the cartels do ...
Directed to intercept: ... diversions are easy to arrange - while agents chase some small group, dozens slip by after they pass.
The only way to stop the whole shebang is to stop the incentives and that means making a public example - ie shoot one and the rest find better things to do elsewhere. You just have to have the political will to follow through despite all the media hand wringing and shyster lawyers yammering.
A fence, a wall standing alone does nothing but waste money no matter how elaborately constructed. Besides, walls etc aren’t going to be funded after the current budget ends - the Democrat House will not fund it. Its either stop them now or just forget the whole idea.