This one is cool and would have helped while I was living in California...I think Hawaii is the only other place so far that welcomes patients from other states...

NEW SECTION. Sec. 406. A nonresident who is duly authorized to
5 engage in the medical use of cannabis under the laws of another state
6 or territory of the United States may raise an affirmative defense to
7 charges of violations of Washington state law relating to cannabis,
8 provided that the nonresident: