Marijuana DUI laws are unjust and confusing. Failing a per se sobriety test doesn't guarantee that a driver is high. Most states with per se DUI laws have set the limit at five nanograms of THC per milliliter of blood. Critics of the laws claim that limit is arbitrary. They also contend that THC measurements are inherently inaccurate.
https://quotewizard.com/auto-insurance/marijuana-car-insurance-and-the-law

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