Source

Leak C. Opioid-related Fatal Overdoses: January 1, 2014 to December 31, 2017. Government of the District of Columbia Office of the Chief Medical Examiner. 2018.

https://ocme.dc.gov/sites/default/files/dc/sites/ocme/Opioid%20related%20Overdoses%20Deaths_1%2022%2018.pdf