UK - London - Police breathalysing driver in night street

A woman driver is breathalysed by an officer from the City of London Police. .The first practical roadside breath-testing device intended for use by the police was the drunkometer. The drunkometer was developed by Professor Harger in 1938. The drunkometer collected a motorist's breath sample directly into a balloon inside the machine. The breath sample was then pumped through an acidified potassium permanganate solution. If there was alcohol in the breath sample, the solution changed colour. The greater the colour change, the more alcohol there was present in the breath.

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A woman driver is breathalysed by an officer from the City of London Police. .The first practical roadside breath-testing device intended for use by the police was the drunkometer. The drunkometer was developed by Professor Harger in 1938. The drunkometer collected a motorist's breath sample directly into a balloon inside the machine. The breath sample was then pumped through an acidified potassium permanganate solution. If there was alcohol in the breath sample, the solution changed colour. The greater the colour change, the more alcohol there was present in the breath.