Gee, well if the other “controlled” executions did not work, how about we try some new ones like the drop from a bomb bay from 40000 feet without a parachute; flame thrower till melted down, water immersion for two hours, and having to listen to an obama speech over and over for a few days.
I think a 100 lb stone chained to the ankles and dropped into the Mariana Trench out in the Pacific would do the trick. And it would be good for the environment without air pollution or wasted real estate.... Food for the fishies.