Thanks!!! http://wdfw.wa.gov/news/mar3012b/
From FAQ section:
Q. Where should I display the Discover Pass?
A. The Discover Pass must be visible in the front windshield of motor vehicles licensed for street use. For vehicles without a windshield, the pass must be displayed in a prominent location on the vehicle. Motorcycle riders may carry the pass with them.
Q. Can I transfer one Discover Pass between two vehicles?
A. Yes, the annual Discover Pass is now transferable between two vehicles. For passes already printed, use ink to legibly write in a second license number, either in the license plate box or in a blank spot on the front of the pass. In the future, passes will be printed with two lines for license numbers. The pass is still only good for one vehicle at a time.
Q. What do I do if I already own a Discover Pass with only one license number on it?
A. It can now be used with two vehicles. Use ink to legibly write in a second license number, either in the license plate box or in a blank spot on the front of the pass. The pass is still only good for one vehicle at a time.
Q. What is the penalty for not having a Discover Pass on my vehicle?
A. The penalty is $99. This penalty is reduced to $59 if an individual provides proof of purchase of the Discover Pass to the court within 15 days after the notice of violation.

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