If you have any class of CDL, you must self-certify what type of driving you do. For details, see:
If you have an interstate CDL, you must keep a copy of your medical examiner’s certificate on record with us. For more information, see:
If you have a commercial driver license (CDL) from a state other than Washington, you must transfer and surrender your prior state’s CDL when you get a Washington commercial license.
If you have a valid CDL issued by another state, you don’t need to take the CDL tests except to:
If you’re transferring a CDL, you must be fingerprinted and undergo a federal background records check before being issued an hazardous materials endorsement when coming to Washington State, even if this process was completed in your home state.