Drowning is a prolonged death due to suffocation but there is a lot of struggling in response to water in the lungs - not fast or humane.
Trying to kill with the CO2 from the tail pipe of a car is also not humane because the exhaust coming directly from the tail pipe is quite hot - burns the airways before loss of consciousness. If you use a really long pipe that would allow the exhaust to cool it could work, but there is always danger to the operator because of exhaust accumulating in an enclosed area.
Cervial dislocation (breaking the neck at the base of the skull) or severe blunt trauma to the skull are humane resulting in almost immediate unconsciousness when done correctly. They are the best methods of killing other than a proper CO2 chamber.
mary v.
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Mary VanderKop
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