[heat02]

I think we have such a "wall", a heavily fortified border however, it's in South Korea. It works over there. Time to employ similar ideas over here.

South Korea's defence ministry is considering deploying robots armed with guns along its border with North Korea.

http://news.bbc.co.uk/2/hi/asia-pacific/4425689.stm

[P-40]

Time to employ similar ideas over here.

Removing the incentives for them to come here in the first place will take care of a large part of the problem.