Scientists develop quick test for marijuana use

https://medicalxpress.com/news/2021-10-scientists-quick-marijuana.html

"rapid test was able to reliably detect THC in people's saliva in under 5 minutes... not only quickly detects THC in saliva, but quantifies the amount... It took about 3 minutes... unlike the case with alcohol, there is no one THC level that defines intoxication... Still, with further refinement, Lee said his team's rapid test could prove useful for roadside testing of drivers suspected of being impaired... potential applications... is to check breast milk, so that babies are not inadvertently exposed to THC"