I found a WA law against recording private communications unless you first announce (or it's apparent) that you're recording it ... or you're a 'frequently-published' media employee (in which case consent can't be withdrawn).
(I didn't find one, but I suspect that any public-recording law would be more restrictive.)
"The Ninth Circuit Federal Court of Appeals first acknowledged the First Amendment right of citizens to film police officers carrying out their duties in public in the case Fordyce v. City of Seattle, 55 F.3d 436 (1995). Later, in Lewis v. State, Dept. of Licensing, 157 Wash.2d 446 (2006), the Washington State Supreme Court also ruled in favor of recording public police activity in the context of a traffic stop."
this has been a long-running massachusetts thing: PD hates being recorded in public.
MA is also one of the very last remaining two-party consent states, which is also an oddity.