In Washington State, what is the legal per-se THC blood concentration limit for DUI?
1 nanogram per milliliter.
WA's limit is higher than 1 ng/mL.
5 nanograms per milliliter.
25 nanograms per milliliter.
WA's limit is 5 ng/mL, not 25.
There is no per-se limit.
WA has an explicit per-se threshold.
Washington set a per-se THC limit of 5 ng/mL in whole blood when it legalized recreational cannabis in 2012. Drivers at or above that level can be charged with DUI regardless of observed impairment. For drivers under 21, any detectable THC is a violation (zero tolerance).
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