UK - London - Police breathalysing driver in night street

A woman driver is breathalysed at the roadside by an officer from the City of London Police. During a night shift in the streets near Liverpool Street Station, the lady blows into the device until the officer tells her to stop, having supplied sufficient breath that can be measured for alcohol in milligrams of Oxygen. When the user exhales into the breathalyzer, any ethanol present in their breath is oxidized to acetic acid at the anode. The overall reaction is the oxidation of ethanol to acetic acid and water. The electrical current produced by this reaction is measured, processed, and displayed as an approximation of overall blood alcohol content by the breathalyser. 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.

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Filename: breathalyser_driver01-21-06-1993_1.jpg
Copyright: Richard Baker
Image Size: 4096x2697 / 661.7KB; police officer night patrol street breathlyser breathalysed driver drinking laws law female lady woman test alcohol limits limit blowing blow percentage percent % amount passing pass fail worry driving breathalysing breathalyse breathalyzing breathalyzer breathalyze suspect stop traffic transportation transport 1990s measuring measure supply milligrams mg
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A woman driver is breathalysed at the roadside by an officer from the City of London Police. During a night shift in the streets near Liverpool Street Station, the lady blows into the device until the officer tells her to stop, having supplied sufficient breath that can be measured for alcohol in milligrams of Oxygen. When the user exhales into the breathalyzer, any ethanol present in their breath is oxidized to acetic acid at the anode. The overall reaction is the oxidation of ethanol to acetic acid and water. The electrical current produced by this reaction is measured, processed, and displayed as an approximation of overall blood alcohol content by the breathalyser. 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.