I haven't seen any such evidence.
I'm not going to waste time arguing with you. Last figures I saw showed that we had an average of one guard for each five miles of the Canadian border and seven guards for each mile of the Mexican border. Still, only an estimated one third of the southern border jumpers get caught. Doubling or quadrupling the guard isn't going to stop the border jumpers.
Instead of being idiots and trying to do something impossible such as seal the border, it is smarter and more effective to concentrate our resources on the transit points leading to the border, starting in the middle east and Asia. No knowledgeable person believes that a fence would do any good at all on the vast desolate mountains and deserts of the border. Even the short Tijuana border gets breached daily by numerous laborers and it has fences, patrol roads, motion sensors, flood lights, planes, helicopters, atvs, uavs, and horseback patrols.
And if we could magically seal the Mexican border, laborers would just come by the gulf coast. Can we seal the coast?