Hmm, why go to all that trouble? Just legalize all drugs.
No, No, No.
Everyone say with me L-A-N-D-M-I-N-E-S. All the way down the border.
Also, add signs warning of unexpected unplanned eruptions due to system glitches. This would give someone w/ a detector pause.
Wait, even better, have a website where users can watch the field for intruders and remote detonate the mines.
Sorry, I keep having these dreams you see...