No system is 100%, but the current system is a “non-system” of security meaning that we are relying on little more than the honor of the individual to obey the laws.
A border fence, with monitors and enforcement will reduce the in bound flow from a flood to a stream.
Add to that, laws that make it difficult or painful for illegal aliens to be in the US and you significantly reduce the motivation to come here in the first place. The stream becomes a trickle. Further, those that are already here start to head back home as per the example set by Arizona.
No work = self deportation.
“A border fence, with monitors and enforcement will reduce the in bound flow from a flood to a stream.”
This “fence” is a joke that Big Brother has pulled on the American people. It has to be a manned wall, not a fence. The Home Depots in Mexico sell bolt cutters. The more poor coyotes and illegals will simply climb a fence.