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Expect a flood of legal challenges in drug-impaired driving cases involving a new roadside device that was approved for use in Canada this week, says a London lawyer.

Justice Minister Jody Wilson-Raybould on Monday gave the greenlight to the Dräger DrugTest 5000, a portable device that can detect the presence of drugs ranging for cannabis and cocaine to opiates and amphetamines in saliva.

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But the German-made device only tests for the presence of drugs in saliva, it doesn’t determine impairment, London criminal lawyer Nick Cake said.

“Right now, it’s very broad and this net is going to catch a lot of people,” Cake said of the device, which detects the presence of pot up to six hours after it was consumed.

With recreational marijuana legal on Oct. 17, existing impaired-driving laws were changed to give police authority to conduct roadside intoxication tests – including oral fluid drug tests – and makes it illegal to drive within two hours of being over the legal limit of tetrahydrocannabinol (THC), the psychoactive component in pot.