Heche’s blood tested positive for benzoylecgonine, cocaine, fentanyl and cannabinoids, according to the reports. Benzoylecgonine, an inactive metabolite of cocaine, merely confirmed she used the drug in the past. Cannobinoids, inactive marijuana metabolites, indicated prior marijuana use, but not on the day of the collision. The fentanyl found in her system was administered after the crash for pain at the hospital, according to the autopsy.
Article source: https://www.huffingtonpost.co.uk/entry/anne-heche-autopsy-reveals-she-wasnt-high_uk_6390b2d6e4b0501fba8b9c32