Canada's top court has affirmed the constitutionality of a law that would allow British Columbia to pursue a class-action lawsuit against opioid providers on behalf of other provinces, the territories and the federal government.

The Supreme Court of Canada decision today is another step toward a potential cross-country action by governments that paid to treat patients who took the addictive drugs.

Section 11 of B.C.'s Opioid Damages and Health Care Costs Recovery Act allows the province to bring an action against opioid manufacturers and distributors on behalf of multiple governments, but also allows a government to opt out of the proceeding.

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