The world’s first roadside laughing gas breathalyser is currently undergoing trials with two police forces across southern England. Hampshire and Isle of Wight Constabulary , alongside Thames Valley Police , are deploying the innovative device to combat what they term an "emerging threat" posed by motorists driving under the influence of nitrous oxide . Commonly known as NOS or "hippy crack", unlawful possession of this Class C drug carries a potential prison sentence of up to two years. A spokesperson for the forces said: “Driving under the influence of nitrous oxide is an emerging threat to the safety of motorists on our roads. “Its use can cause unconsciousness and even neurological damage or death from suffocation of the oxygen supply to the brain. “Tragically, our officers have already seen deaths connected to drivers who were under the influence of NOS. “The innovative device is being tested by our officers to see if it can be used to detect if a driver is under the influence of this harmful drug.…