It is illegal for anyone, of any age to:
- Possess and/or use marijuana under the age of 21 unless the person is medically authorized
- Drive while under the influence of marijuana
- Use marijuana in public places
- Grow marijuana plants unless the person is medically authorized or licensed by the state as a marijuana producer
Note: It is illegal for adults to provide marijuana to minors. It is also illegal for parents to provide marijuana to their children.
It is legal for individuals 21 or older to use and possess up to:
- 1 oz. of useable (smokable) marijuana
- 16 oz. of marijuana-infused products in solid form (like cookies or brownies)
- 72 oz. of marijuana-infused products in liquid form (such as juice or tea)
- 7 grams of marijuana concentrate
Source: Washington State Liquor and Cannabis Board, Marijuana Education: Know the Law, 2019