There’s also this.
Drug use tops booze for first time in fatal U.S. crashes: study
https://www.reuters.com/article/us-usa-drugs-crashes/drug-use-tops-booze-for-first-time-in-fatal-u-s-crashes-study-idUSKBN17S2P5
Drug Impaired Driving
A Guide for States
GHSA
http://www.ghsa.org/sites/default/files/2017-04/GHSA_DruggedDriving2017_FINAL.pdf
Nothing significant has been done about it, though. Many people in high places are potheads and very politically active. Few non-addicts want to get involved. Police answer complaints about incidents with, in essence, “So what? What do you want me to do about it?” Too many of them are getting high, too, and drug tests aren’t being done without announcements behind the scenes in advance in many jurisdictions.
That’s why it’s been spreading so fast. There’s no “war on drugs.” What we’re seeing is something more like local campaigns across the country to get as many addicted as possible while blocking efforts against it.
"The study included any substance that can impair driving, including illegal drugs, prescription medications, legal non-medicinal drugs and over-the-counter medicines."
Should we ban them all?