The Washington state Supreme Court unanimously upheld the constitutionality of its state law imposing driving under the influence punishments for impairment from cannabis consumption on May 12.

In 2017, according to the appeals court’s opinion, Douglas Fraser III was convicted of driving under the influence under the state’s THC prong for driving with a THC blood level of 9.4 nanograms per milliliter within two hours of driving. Fraser’s THC level was nearly twice the state’s 5.00 ng/mL limit at the time of his arrest.