If the State participates in negotiations in BC or Oregon or California (which they do) they are bound by the laws of those jurisdictions, not by WA laws. The "out" in the State/Tribal negotiations is that when the occur on Reservation the governing law is Tribal. So, if the Tribes insist in meeting on Rez it is their rules. If the State aquiecieses (sp?) then they agree that the Tribe's desire for secrecy is necessary to a successful (to someone) outcome.