Not much help in Washington, but in Virginia, after a fairly exhaustive search, I can find absolutely no authority for LEO's to issue orders at all, except pursuant to specific statutes (e.g., commanding a motorist to stop, ordering a trespasser off of property, etc.), or pursuant to an order issued by a court of competent jurisdiction - and in the latter case, it's really the court's order that has to be a "lawful order" as the cop is just communicating the court's order. The one thing I can think of that isn't covered specifically is obstruction of justice. If a cop orders people to stop interfering with an arrest, for example, those people could be charged with obstruction, but not with "refusal to obey".