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A Vancouver-based law firm is calling on the federal government to recall its roadside drug-testing machines until they have proved effective or been replaced by a more reliable model.

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The controversial Dräger DrugTest 5000 uses a saliva swab to test drivers for the presence of commonly-consumed drugs such as THC (a psychoactive and intoxicating compound in cannabis), opiates, amphetamines, cocaine (and metabolites), and benzodiazepines.

The machine was approved in late 2018 before federal cannabis legalization came into force.