Almost half of all drivers who were killed in crashes and tested positive for drugs also had alcohol in their system. Driving Under the Influence of Alcohol and Illicit Drugs. 2014.

Almost half of all drivers who were killed in crashes and tested positive for drugs also had alcohol in their system.
Driving Under the Influence of Alcohol and Illicit Drugs.

https://www.samhsa.gov/data/sites/default/files/report_2688/ShortReport-2688.html