re: “... a test to determine how stoned you are.”
Google search on: pot reaction time studies
https://www.healthline.com/health-news/difficult-to-develop-roadside-test-for-marijuana
https://www.palmbeachpost.com/news/crime--law/new-are-you-driving-stoned-dui-tests-slow-develop-for-marijuana-use/ZOwmra7tr16oU13YUNIJ6M/
Reaction time is nice, but doesnt translate to the same thing as a blood alcohol test. Tests tell whether theyre high,..just not how high. Google this instead....https://www.google.com/search?rlz=1C1AOHY_enUS708US708&ei=GLPMW-TPLs6vzwLf87eQDA&ins=false&q=tests+for+how+stoned+on+pot+while+driving&oq=tests+for+how+stoned+on+pot+while+driving&gs_l=mobile-gws-wiz-serp.3..33i22i29i30.40431.49724..50600...0.0..0.184.4178.21j20......0....1.......3..0j41j0i67j0i131j46i131j0i10i312j0i22i30j0i312j0i22i10i30j33i299j33i160.12LTbqMk7vg