There are a variety of different approaches that have been taken in different jurisdictions, and the types of substances that are included by jurisdictions reflect the use patterns that they see in their jurisdictions. The inclusion of fentanyl as part of the drug supply in Canada and in North America in general is what makes our drug supply so toxic, and what makes it so deadly to Canadians. For that reason, in order to reduce stigma, British Columbia included it as one of the four categories of substances in its exemption proposal. It reflects the usage.
On June 15th, 2022. See this statement in context.