Calls are growing for alcolocks to be introduced for repeat drink-driving offenders in the UK, as the Government considers further measures aimed at reducing alcohol-related deaths and injuries on roads.
Senior police officers and road safety organisations have urged Prime Minister Andy Burnham to introduce a mandatory alcolock programme for high-risk and repeat offenders, according to a recent report by The Independent.
But what exactly are alcolocks, how do they work, and could they become an important part of the UK’s approach to drink driving?
What Is an Alcolock?
An alcolock, also known as an alcohol ignition interlock, is a device connected to a vehicle’s ignition system.
Before the vehicle can be started, the driver must provide a breath sample. If the device detects alcohol above its programmed limit, the vehicle will not start.
The technology is therefore designed to prevent someone from driving after consuming alcohol rather than relying solely on detection and prosecution after the offence has taken place.
Alcolocks are already used in a number of countries, including Australia, Belgium, Canada and parts of the United States.
Why Are Alcolocks Being Discussed Now?
A coalition including the National Police Chiefs’ Council, RAC and Road Safety Great Britain has called for alcolocks to become a mandatory condition for some convicted drink drivers before they are permitted to return to the road.
The groups have specifically highlighted high-risk and repeat drink-driving offenders.
According to figures reported by The Independent, 27,837 motorists in Britain were convicted of drink driving on multiple occasions during the 11 years to July 2024. An estimated 260 people were also killed in crashes involving at least one driver over the legal alcohol limit in 2023, with approximately 1,600 seriously injured.
The campaigners argue that an alcolock programme could help prevent further offences by physically preventing an affected vehicle from being driven where alcohol is detected.
Do Alcolocks Actually Work?
There is evidence that alcohol interlocks can significantly reduce repeat offending while the devices are fitted.
The Government’s recent consultation on motoring penalties states that a synthesis of previous studies found alcolocks effective at reducing drink-driving re-offending during the period in which they were installed.
Earlier public-health evidence has similarly identified substantial reductions in re-arrest rates among both repeat and first-time drink-driving offenders using interlock devices. However, an important limitation has also been identified: once the device is removed, re-offending rates can return towards those seen in drivers who did not have an interlock installed.
This suggests that alcolocks may be most effective when used alongside measures such as rehabilitation, education and appropriate monitoring rather than being viewed as a complete solution in isolation.
What Could Alcolocks Mean for Drink-Driving Cases?
If alcolocks become part of the UK drink-driving framework, they could introduce another technical and evidential element into certain cases.
Questions could potentially arise regarding:
– the accuracy and calibration of the alcohol interlock;
– the breath sample provided by the driver;
– maintenance and servicing records;
– attempts recorded by the device;
– the interpretation of stored data; and
– whether the device was operating correctly at the relevant time.
As with existing evidential breath-testing equipment, the reliability and interpretation of alcohol measurement technology can become important where its findings are disputed.
