The drink-drive breathalyser is 50 years old, with police carrying out the first roadside breath test on a motorist in Shropshire on October 8, 1967.

In 1967 there were 1,640 road fatalities attributed to alcohol. Since then, there’s been an eight-fold reduction in the number of deaths alongside a dramatic increase in car ownership.

But 200 people a year still die in accidents where at least one driver is over the alcohol limit, according to the latest statistics from the Department for Transport (DfT). 

Final figures for 2015 show a 9% increase in the number of seriously injured casualties - from 1,070 in 2014 to 1,170 - the first rise since 2011.  

The total number of casualties in drink-drive accidents for 2015 was 8,470 – up 3% on the previous year.

Men were twice as likely as women to fail a breath test, a trend that was consistent across all age groups according to the DfT report.

The Road Safety Act of 1967 set the maximum limit at 80mg of alcohol per 100ml of blood (0.35mg of alcohol per litre of breath).  It became an offence for the first time to be in charge of a motor vehicle with a blood or breath alcohol concentration exceeding that limit.

Hunter Abbott, advisor to the Parliamentary Advisory Council for Transport Safety (PACTS) and managing director of breathalyser firm AlcoSense Laboratories, said: "It seems remarkable now that the new law was greeted with outrage in some quarters, with publicans heckling the then Transport Minister, Barbara Castle, accusing her of damaging their trade.

“In the first 12 months alone, there were 1,000 fewer deaths and 11,000 fewer serious injuries on the roads – proving that the use of the ‘drunkometer’ was both necessary and justified."

The original ‘blow in the bag’ breathalyser was a relatively crude device, initially used to confirm a policeman’s suspicion that a motorist was under the influence.  A subsequent blood or urine test at the police station provided the evidential proof.

The fuel cell alcohol sensor was later developed, an electronic device that transformed the process of screening by providing the police with a quick test to accurately quantify the driver’s alcohol level at the kerbside.

For prosecution a second evidential test needed to take place at the station using a second, more precise method than used at the scene.

Until the 1990s, this involved blood or urine testing at the station which required a doctor to be called out to take the sample.

If a doctor was unavailable, sometimes a driver could escape prosecution. The process was dramatically simplified with the invention of evidential infra-red breath testing at the station, offering comparable accuracy to blood testing - removing the need for a doctor to be called out and improving the prosecution rate.

Hunter Abbott, said: “There are still more than 5,000 accidents a year where at least one driver is over the alcohol limit, and nearly a fifth of drink drive convictions are the morning after the night before.

“Studies also show that if you drive while having only one-eighth of the English drink drive limit in your system (one fifth of the Scottish limit), you are 37% more likely to be involved in a fatal accident than when sober." 

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