Which is a methanol related health and safety measure grandfathered in as a holdover from the Volstead Act. All first world control have significant hazard analysis and supply chain integrity measures for food and drink.
Temperance related measures post-Volstead - an insidious loophole to appease the Bible Belt whereby liquour is specifically exempted from the federal oversight of interstate commerce.
I believe there's some relation between this and federal highway funding being tied to a minimum drinking age of 21, but I may be misremembering some half-read magazine article.
Tangential—methanol poisoning from an improper brewing or distilling process is largely, maybe completely, a myth. Where toxicity events have occurred they are almost always deliberate or accidental adulteration, e.g. fortifying moonshine with industrially "denatured" (deliberately poisoned) alcohol. There has been a lot of sloppy journalism in such cases that doesn't question the myth, as well as Prohibition-era propaganda that lives on to this day.
TIL. That said, I hadn't anticipated much rational in Prohibition rationale. The thread did support my suspicion that grappa hangovers are their own special category of hell though!
