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February 5, 2021
PubMed.gov

 

"Conclusions:
There appears to be a poor and inconsistent relationship between magnitude of impairment and THC concentrations in biological samples, meaning that per se limits cannot reliably discriminate between impaired from unimpaired drivers. There is a pressing need to develop improved methods of detecting cannabis intoxication and impairment."



https://pubmed.ncbi.nlm.nih.gov/33544004/

 

More impairment studies here