Earlier quoted context omitted.
Except 100% ethanol would be considered a poison too. 100ml (4 ounces) could likely kill a 5 year old child. https://www.alcohol.org.nz/alcohol-its-effects/health-effect...
Absolute alcohol (200 proof ethanol) has a number of ways to kill you. It's slightly poisonous on its own. It's a massively powerful dessicator, so it can turn tissue into leather. And, if you've got industrial quantities of the stuff, it's probably not quite pure: turns out you can't just distill it past 190 proof due to water and ethanol forming an azeotrope. To push past that limit requires azeotropic distillation…
Downsides: It's flammable and you wouldn't want it accessible with kids around.