RCW 26.44.130: Arrest without warrant.

When a peace officer responds to a call alleging that a child has been subjected to sexual or physical abuse or criminal mistreatment and has probable cause to believe that a crime has been committed or responds to a call alleging that a temporary restraining order or preliminary injunction has been violated, the peace officer has the authority to arrest the person without a warrant pursuant to RCW 10.31.100.