Police in southern England are trialling the world's first breathalyser capable of detecting nitrous oxide, commonly known as laughing gas, in drivers [1].

The technology aims to close a legal gap in road safety by providing a rapid method to identify drivers under the influence of the gas. This allows authorities to pursue drug-driving prosecutions more effectively when traditional tests may be insufficient.

The trial is being conducted across Hampshire, the Isle of Wight, and the Thames Valley area [1]. While some reports indicate two forces are involved [2], others specify that the Hampshire Constabulary, Isle of Wight Constabulary, and Thames Valley Police are testing the device [3].

Nitrous oxide is often misused for its dissociative effects, which can impair a driver's judgment and reaction times. By using this new breathalyser, officers can identify the presence of the gas immediately during a roadside stop, a significant shift from slower laboratory processing.

The initiative is designed to deter the use of laughing gas before operating vehicles and to increase the number of successful convictions for those who do [1]. This deployment represents a first-of-its-kind effort to target this specific substance through roadside screening [1].

Law enforcement agencies in the region are monitoring the accuracy and reliability of the device during this phase. If the trial proves successful, the technology could potentially be rolled out to other police forces across the United Kingdom to improve overall road safety [1].

“Police in southern England are trialling the world's first breathalyser capable of detecting nitrous oxide.”

The introduction of a nitrous oxide breathalyser marks a shift toward more specialized chemical screening at the roadside. By moving beyond standard alcohol and common narcotics tests, police are adapting to the prevalence of legal-but-misused gases. If validated, this tool provides a legal mechanism to criminalize the impairment caused by laughing gas, which has previously been difficult to prove instantly during traffic stops.