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A

Anonymous

Jan 20, 2025

What constitutes 5 nanograms of THC, for impaired driving?

As medical marijuana becomes more widely available, states are introducing legal driving limits for marijuana impairment, regardless of whether it was obtained legally or not. Colorado is among the first states to implement such a standard, equating 5 nanograms of THC in the bloodstream to a 0.08 blood alcohol level for impaired driving. Can someone with more expertise on THC levels explain this in practical terms? Specifically, how much marijuana would a person need to consume—considering factors like body weight and the type of cannabis—to reach a 5-nanogram THC reading?

2 Answers

A
Anonymous

Dec 10, 2024

“Concentrations vary depending on the potency of marijuana and the manner in which the drug is smoked, however, peak plasma concentrations of 100-200 ng/mL are routinely encountered. Plasma THC concentrations generally fall below 5 ng/mL less than 3 hours after smoking”

so 100-200 nanograms are routinely encountered during the peak meaning i doubt you could realistically smoke any amount and reach a concentration that low. one hit of decent quality medical grade would most likely send you well past 50. that’s my interpretation of the data so don’t take it as the last word but i feel my reasoning is sound

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