Driving and DUI
Driving under the influence of marijuana is illegal in Washington and carries serious penalties. THC is the psychoactive ingredient in marijuana. Similar to the 0.08 blood alcohol limit, it is illegal to drive with 5ng/ml of THC or more in your blood if you are 21 or older. If you are under 21, it is illegal to drive with any amount of THC in your blood.
The blood test is performed at a police station or medical facility and requires a blood draw. Published research says it can take 3 hours for some people to drop below 5ng/ml after using marijuana, but it can take longer depending on multiple variables such as gender and body size.
It is less risky to wait at least 5 hours before operating a vehicle. Keep in mind that edible marijuana products can remain in your system much longer.
If you are not sure whether you are impaired, do not drive! Call a taxi or use a designated driver.
Where to Consume
Private vs. Public:
Washington State law protects private marijuana use, so you can consume openly in a residence as long as the property owner allows it. Marijuana cannot be consumed in public view, such as on streets and sidewalks, or in public parks. In addition, the state’s Smoking In Public Places Law (RCW 70.160) prohibits smoking of any kind in public areas and in places of employment.
As with tobacco, smoking marijuana in any indoor location is subject to the restrictions in the Washing State Smoking In Public Places Law. The law prohibits smoking in a public place or place of employment, and within 25 feet of entrances, exits, windows that open, and ventilation intakes that serve an enclosed area. If the establishment permits it and you are either vaporizing or staying in a room in which smoking is allowed, it is legal to consume marijuana in a private hotel room.
Boating, Hiking & Skiing:
According to the US Coast Guard, if you are in navigable waters, they will enforce federal law. Possession of marijuana is still illegal federally. This is also true at national parks. And it is never okay to operate a boat while impaired by marijuana or any other drug. The law against marijuana use in public view applies to state parks, public hiking trails, and ski resorts.