It’s only legal when the government does it.
Wa state is like DC..two party consent for recording audio to make it harder to catch crooked politicians.
However...WA state also has recent case law making a person’s vehicle almost an extension of their home as it lertains to privacy, searches by police, and seizing of evidence.
I wonder how that will play into recording in your own vehicle when somene steals it or when a valet is parking it.