1. “Overdose death rates”, NIH National Institute on Drug Abuse, January 2019 at https://www.drugabuse.gov/related-topics/trends-statistics/overdose-death-rates
2. Changes in Synthetic Opioid Involvement in Drug Overdose Deaths in the United States, 2010-2016
3. “Presence of drugs in drivers”, DOT's National Highway Traffic Safety Administration at https://www.nhtsa.gov/sites/nhtsa.dot.gov/files/documents/13839drugged_facts_flyer_101918_v8_002.pdf
4. “2017 fatal motor vehicle crashes: Overview”, DOT's National Highway Traffic Safety Administration, at https://www.nhtsa.gov/press-releases/us-dot-announces-2017-roadway-fatalities-down
5. “Deaths in the home”, 2019 US National Safety Council at https://injuryfacts.nsc.org/home-and-community/deaths-in-the-home/deaths-in-the-home-by-age-group/