In Washington you can be convicted of DUI or driving under the influence for both the use of drugs and/or alcohol while driving. You can be convicted  if your blood alcohol concentration (BAC) is .08% or greater. A driving under the influence (DUI) charge is a crime committed by operating a motor vehicle while impaired by drugs and/or alcohol. Legal limit in Washington Standard, non-commercial drivers: .08% BAC Commercial drivers: .04% BAC Drivers under 21: .02% BAC Penalties, Fines, & Suspension Washington DUI & DWI Penalties, Fines,