When can I expect Arraignment for my DUI arrest?

It depends. Some officers will give you this date when arrested (Seattle Police Dept.) others you will receive date in the mail within 20 – 30 days or so. (Washington State Patrol) Just depends on the arresting agency and area of the State. It is a good idea to have hired an attorney by your 1st Court appearance, if possible. Also, blood test DUI arrests usually take several months before charges are filed.