alt Hacker NewsMight as well plug this recent Criminal Podcast episode: https://thisiscriminal.com/episode-358-the-formula-3-27-2026
TLDL: During prohibition, US government required adding 5% methanol to industrial alcohol, hoping that this would stop bootleggers from selling it as liquor. It was sold anyway, resulting in many deaths.
To be fair, we still add 5-10% methanol to industrial alcohol. But also a bunch of bitterants to discourage use.