What do prisons do to keep criminals in? A couple of fences, one slightly shorter than the other running parralel spaced around 5 ft apart. Razor wire looped oround both fence tops. BUT.. Go one step further-- Electrically charge the fences.. Like one big bug zapper (space fences slightly closer).
OH-OH! Can't do that here on the left coast! Might 'harm' the bugs and/or 'threaten' the snakes. ...'sides, by the time you got your 'EIR' done, to get 'permission' to do that, it'd already be 'mexifornia'. (Okay then... If you don't believe me, just ask Cruz Bustamante!)