Is it legal to listen to a scanner while driving in Washington state?

I'm from Oregon, where scanners are legal in your vehicle, and no permit or HAM license is required to listen. I'll be in Washington state for a while soon, though, and wanted to be sure I'm legal listening while on the road. If you reply to this and happen to know the source of your information - for example, if you can cite the law number, etc - that would be great, for added certainty. Otherwise, if you have recent experience driving with your scanner in the state, please let me know if you've ever encountered any problems with law enforcement saying it's a no-no.... or, for that matter, with law enforcement telling you it's fine. Or, even better, if you ARE an officer in Washington and are reading this now, and can tell me for sure one way or the other, that's even better.



I don't want to risk a ticket. :)