Final answer:
In Washington state, the minimum legal drinking age (MLDA) is 21. Minors are not allowed to have any BAC while driving. Adults in Washington state are considered legally intoxicated if their BAC is equal to or above 0.08%.
Step-by-step explanation:
The Washington state law sets the minimum legal drinking age (MLDA) at 21 years old. Therefore, it is illegal for minors (individuals under the age of 21) to have any alcohol in their system while operating a vehicle.
This means that minors are not allowed to have any percentage of blood alcohol concentration (BAC) while driving.
For adults, the legal BAC limit in Washington state, as in most of the US, is 0.08%. This means that if an adult's BAC is equal to or above 0.08%, they are considered legally intoxicated and are not allowed to drive.