"what we see here is an association between cannabis and paranoia. Experts generally agree that regular use of cannabis starting from an early age is an accurate predictor of later severe mental health problems, but what hasnâ(TM)t been established is whether the drug causes paranoid thoughts. Maybe people suffering from paranoia are more likely to start taking cannabis; or perhaps the drug use and the suspicious thoughts are independent consequences of another factor entirely"- from your 2014 paper link...
Australia, of all places, developed a roadside saliva swab for thc levels. But most of our prisons are for profit...... So that's why you never heard of such things.... They don't want you to know. Being weed paranoid has kept alot of potheads out of jail. And then there's dumb fucks who shouldn't be allowed to have any thc due to lack of functioning brain cells.