RCW 46.64.030: Procedure governing arrest and prosecution.

The provisions of this title with regard to the apprehension and arrest of persons violating this title shall govern all police officers in making arrests without a warrant for violations of this title for offenses either committed in their presence or believed to have been committed based on probable cause pursuant to RCW 10.31.100, but the procedure prescribed herein shall not otherwise be exclusive of any other method prescribed by law for the arrest and prosecution of a person for other like offenses.