D.C. is tightening cannabis advertising to protect young people while Virginia is building a regulated market from scratch—both developments show cannabis policy is maturing toward responsible frameworks. Arizona state senators approved measures to criminalize ‘excessive’ marijuana levels while driving, establishing impairment thresholds for cannabis-intoxicated driving. The legislation represents the evolving challenge of setting scientifically valid DUI standards for cannabis, as THC metabolites persist in the body long after impairment fades.