A police Drunkometer in New Jersey, circa 1940. Invented by Rollo Harger in 1938, the Drunkometer measures people's alcohol levels by analysing their breath. (Photo by Orlando/Three Lions/Hulton Archive/Getty Images)
A police Drunkometer in New Jersey, circa 1940. Invented by Rollo Harger in 1938, the Drunkometer measures people's alcohol levels by analysing their breath. (Photo by Orlando/Three Lions/Hulton Archive/Getty Images)