RCMP in the Northwest Territories have begun using roadside cannabis-screening technology that has faced criticism from defence lawyers elsewhere in Canada.
Mounties in the territory announced late last month that they had deployed devices designed to take a saliva sample and test for the presence of tetrahydrocannabinol, also known as THC, the main psychoactive substance in cannabis. They said the technology would help them detect impaired drivers and make roads safer.
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“It can lead to people being arrested who are actually innocent,” said Kyla Lee, a lawyer based in Vancouver.
Lee said research has shown the devices may be more likely to deliver false results in extreme cold temperatures, and movement during analysis could also affect outcomes. She added that while the devices can deliver either a positive or negative test result, they do not indicate how much THC may be in a person’s bloodstream.
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