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OTTAWA — Though it’s now legal to smoke cannabis for fun in Canada, that doesn’t mean it’s all a hazy high from here on out for the federal government. Since the Liberals introduced their landmark pot legalization bill in April 2017, lawyers and constitutional experts have pointed to several parts of the new marijuana rules that could still cause legal headaches.

From home cultivation to roadside testing to advertising, battles are already brewing over legal weed. Here are six pot law pitfalls that are most likely to end up in court.

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Impaired driving

Canada’s new impaired-driving law has been a favourite punching bag for lawyers since it was tabled last year. The new rules, which set out a legal limit for the level of THC in a driver’s blood, allow police officers to test saliva using roadside screening devices and to collect blood samples.

However, there’s not a clear link between the level of THC in the blood and the degree of impairment, as there is with alcohol, and lawyers have warned the new rules will likely face a constitutional challenge.