I'm becoming a bigger and bigger fan of crucifixion for some of these more egregious cases. That Thai cop who went on the murder spree in the daycare center today is another strong argument for a couple of 4x6 timbers and a nail gun loaded with 16d framing nails.
Good Lord, D6, have you seen the cost of building materials lately? One 6x6x12' beam runs $118 here at Lowe's in the U.S. And then you need two of them, so right out the gate you're looking at $236. Maybe in Thailand it's cheaper -- dunno. And then you have to factor in the cost of those nails for the nail gun. But getting a prisoner to dig the post hole shouldn't be a problem.
I'm tellin' ya, D6. It's getting harder and harder to find a cheap way to execute a perp with the Maximum Pain Factor (MPF) pre-installed!
I must think on this...