Science will surely destroy the planet

[Minimalist]

Mexican farm workers cross our border at will....and we are looking for them.

I was of the opinion that was typically carried out on foot. I could be wrong, though.

At any rate, the chances of any South American country going to war with us are slim. The better bet would be to get it overseas, which would require a delivery system. Also, a homemade nuke in the back of a truck is not likely to make it anywhere, in my opinion. Chances are, the thing will become unstable and blow early or never blow at all.

http://en.wikipedia.org/wiki/Suitcase_nuke

Suitcase nuclear weapons

There has been no official information released on the existence of true suitcase or briefcase-sized nuclear weapons in either the U.S. or Russian arsenals. However, the Washington, D.C.–based intelligence-firm, Center For Defense Information (CDI), states that the US government produced a class of nuclear devices in the late 1970s which were small enough to fit into an actual suitcase or briefcase.[citation needed] Likewise, CDI claims that a detailed training replica—with dummy explosives and no fissionable material—was routinely concealed inside a briefcase and hand-carried on domestic airline flights in the early 1980s.[6][non-primary source needed]

While the explosive power of the W54—up to an equivalent of 6 kiloton[7] of TNT—is not much by the normal standards of a nuclear weapon (the bombs dropped on Hiroshima and Nagasaki at the end of World War II were around 16 to 21 kilotons each), their value lies in their ability to be easily smuggled across borders, transported by means widely available, and placed as close to the target as possible.

This was the American program - you know, the "xtian soldiers." The Russians developed similar devices.

I wonder if they know where all of them are?