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Without a reliable roadside test to conclusively prove a driver is impaired by marijuana, avoiding wrongful convictions when weed is legalized in Alberta could be a problem.

That was one of the take-aways for Alberta Justice Minister Kathleen Ganley after her trip to Denver, Colo., last week where she met with officials to pick their brains about what systems need to be in place in this province if and when marijuana is legalized.

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Prime Minister Justin Trudeau made the “legalizing, regulating and restricting access to marijuana” commitment as part of his election platform, with a view to have legislation introduced in spring 2017. A federal task force set to deliver in November its findings on regulation and restriction of marijuana, provinces are rushing to do their own research.

Colorado became one of the first states in the U.S. to legalize recreational marijuana two years ago. Many politicians look to it as a cannabis case study.

“The big, top-line message is this needs to be done very carefully and with a lot of regulations,” Ganley said Monday.

“Their experience was that it didn’t solve all of the problems that suggested it might, but it also didn’t result in new criminal activities.”