In the end, it was sort of like putting the bartender in charge of the breathalyser.

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The government is considering the introduction of a drug test, similar to a breathalyser, for motorists.

BBC: Tests for drug drivers

It may be the next step forward from Mr Borkenstein's breathalyser of 50 years ago.

ECONOMIST: Robert Borkenstein

It is considering the introduction of a drug test for motorists which would be similar to a breathalyser.

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Competitors to the breathalyser, and claimed to be more efficient at measuring alcohol, are now on the market.

ECONOMIST: Robert Borkenstein

His breathalyser reading of 44 micrograms of alcohol per 100 millilitres of breath was only narrowly over the legal limit of 35, she added.

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The chopper breathalyser is featured in the BBC's new Oceans series, which records a series of underwater scientific expeditions aimed at building up a global picture of the state of our seas.

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As the inventor of the breathalyser, a name that went into the dictionary, Mr Borkenstein was in much demand as a speaker in a country in love with the car but appalled by the carnage on the road.

ECONOMIST: Robert Borkenstein