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64 per cent of study participants who tested positive for fentanyl reported knowingly using the substance. This number is up from 2015 where a previous study found that the majority of people (73 per cent) who tested positive for fentanyl did not know they used it.

“This was actually a study using a really neat combination of old[er] data and new[er] data,” said Dr. Catherine Johnson, an author of the study and professor in UBC’s department of earth, ocean and atmospheric sciences.

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