OLYMPIA, Wash. (AP) — Washington state is launching its statewide coronavirus exposure app, joining more than a dozen other states that have already enlisted the use of smartphone technology in the ongoing effort to prevent the spread of COVID-19. Starting Monday, people with iPhones can enable the ‘exposure notifications’ feature that is already in their phone’s settings, and Android devices can download the app. Use of the app is voluntary and users can opt out at any time. The statewide expansion comes after a monthlong pilot project at the University of Washington. The technology, created by Apple and Google, is in use in more than 30 countries and more than a dozen states in the U.S. Washington was among five states with pilot programs already testing the technology.