UK Trials World’s First Laughing Gas Breathalyser for Drivers
The UK is testing a world-first roadside device designed to detect drivers under the influence of nitrous oxide, commonly known as laughing gas or N₂O. The trial is being led by Hampshire and Isle of Wight Constabulary and Thames Valley Police in response to rising concerns about drug-impaired driving.
A new tool for a growing road safety problem
Nitrous oxide is a Class C drug in the UK, and its misuse has become increasingly associated with dangerous driving behaviour, particularly among younger motorists. Authorities say the substance can cause unconsciousness, oxygen deprivation, and in severe cases, death.
Until now, police have had no reliable roadside method to prove recent inhalation of nitrous oxide. This gap has made prosecutions difficult, even when impairment was strongly suspected.
The new breathalyser device aims to change that.
How the laughing gas breathalyser works
Developed by Respira Technologies, the portable device allows a driver to exhale into a handheld unit. Within minutes, it can detect whether nitrous oxide has been inhaled within the previous two hours.
The technology was created following research collaboration with the Vrije Universiteit Amsterdam.
Police say this could become a standard tool in roadside drug enforcement if the trial proves successful.
Why police are testing it now
Officers from the joint roads policing units say they are seeing an “emerging threat” from nitrous oxide use among drivers, particularly in the 16–25 age group.
They report that some motorists are using the substance shortly before or even while driving, significantly increasing the risk of crashes, unconsciousness, and fatal injuries.
The trial is intended to:
▪️Improve detection of drug-impaired driving
▪️Strengthen evidence for prosecutions
▪️Reduce serious road traffic incidents
Tragic cases highlight the risks
The urgency behind the trial is reinforced by fatal incidents linked to nitrous oxide use. In one case cited by police, three teenagers died in a crash in Oxfordshire after a driver was filmed inhaling laughing gas moments before driving at high speed.
Authorities say such cases underline the dangers of combining intoxication with driving.
What happens next
The four-week trial will assess how reliable and practical the device is in real-world policing. If successful, results will be presented to the UK Home Office for consideration.
A government spokesperson has already indicated support for stronger roadside testing powers as part of broader road safety reforms.
A potential shift in drug-driving enforcement
If adopted nationally, the device could mark a major shift in how UK police detect and prosecute drug-driving cases involving nitrous oxide.
For now, the trial represents an early but significant step toward closing a long-standing enforcement gap on UK roads.
