The "lethal injection" was offered up as a more humane way to execute condemned criminals. Up until recently it has mostly consisted of:
STEP ONE - Sodium Thiopental - To put someone to sleep and "generally" anaesthetize them.
STEP TWO - Pancuronium Bromide - Paralyzes everything, including beathing muscles. ( I wonder how this differs in effect from Anectine ? Perhaps longer lasting. )
STEP THREE - Potassium Chloride - Stops heart. ( Found in "salt free" substitute in smaller amounts BTW ! Also supposedly used at times by the CIA to kill unwanted people in such a way that it looks as though they died of common heart failure. )
Prisoners such as Joseph Clark have been known to gasp "Don't work ! Don't work!" indicating Step One was only partially effective. It is thought that some prisoners may have been fully conscious as the paralysis set in. "I hate it when that happens. " Diprivan is suggested as a more modern substitute for the Thiopental. "He looks so peaceful."
I wonder how often the authorities purposely went light on Step One so that the murderer received more "punishment" on the way out ?