[gridlock]

Effective operation of a “virtual fence” presupposes that the government wishes to enforce the law. If they decide to watch somebody cross the border on a camera located five miles away, it won’t make any difference unless they go out and pick him up.

[untrained skeptic]

Effective operation of a “virtual fence” presupposes that the government wishes to enforce the law.

Effective operation of the border requires that the government enforces the law regardless of what detection and deterrent methods are used to a great extent.

Given a little time, fences can be cut, vehicle barriers removed or destroyed, ditches filled in, etc.

I will agree that it is less obvious that the laws aren't being enforced if the illegal crossers don't have to leave a trail of destroyed barriers, and that destroying the barriers requires extra effort and tools.

However, barriers and surveillance are really tools to aid in enforcement. They do little by themselves.

[Recon Dad]

Effective operation of a “virtual fence” presupposes that the government wishes to enforce the law

We have missed the point of this exercise, it is to be used for taken the census not halt crossings.