Proving whether a driver was drunk had been problematic for the authorities since the days of the Ford Model T. Cue Indiana University biochemist and toxicologist Rolla N. Harger, who had been working since 1931 on a machine to put hard evidence behind a police officer's claim.
Harger finally got a patent for the Drunkometer in 1936. The upshot? A person would blow into a balloon, and the air would drop into a chemical solution, with the corresponding color change indicating blood alcohol content.
(via Neatorama)
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