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The death penalty is not progress in modern society : Comments
By Michael Hayworth, published 24/5/2013For years scientists have theorised that it's not intelligence that makes mankind unique, but our conscious ability to learn, and to improve.
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I can't comment on the use of Nembutal (or other drugs), but you are mistaken about the inert-gas-filled plastic bag. I am surprised you may not be aware of Shallow Water Blackout - where a diver who has undertaken lengthy hyperventilation in order to saturate their blood with oxygen (to extend the length of their dive), concurrently expelling most of the CO2 from their blood-stream, simply runs out of oxygen before the CO2 level in their blood can trigger the brain's breathing centre - they simply black-out when the oxygen supply to the brain becomes inadequate to maintain brain function, and they then may drown (if they start to breathe automatically whilst still underwater without regaining consciousness), or they just die from anoxia (brain-death).
Unfortunately death from shallow water blackout is not rare, and those who succumb do so without feeling a thing - they simply fall into unconsciousness without warning, and never wake up.
(You will have noted that it is CO2 concentration in the blood which triggers the brain's breathing centre, and not any lack of oxygen.)
The same effect could be obtained by placement of an individual in a sealed room filled only with nitrogen or carbon monoxide (both colourless and odourless gases), and without any hyperventilation being necessary to induce blackout and subsequent death. Not too brilliant maybe, but it would be entirely painless.
This would be a similar death to those who fall asleep in a carbon monoxide atmosphere (as can be and has been occasioned by a leak in a natural gas supply in the home from a gas heater or stove), or from the use of a combustion heater or portable generator or other combustion engine in an enclosed space (such as a closed bedroom or lounge room during winter, or down a mine shaft), or in motor vehicle which leaks exhaust carbon monoxide into the cab.
(As you will be aware, the blood's haemoglobin takes up CO more readily than it does oxygen.)