https://healthalerts.stanford.edu/covid-19/2021/04/29/covid-19-testing-update/

At Stanford University, new requirements have been implemented as of May 2, 2021. Graduate and professional students living on campus will only need to get tested once per week. Undergraduate students will continue to get tested twice per week. Faculty will have testing available voluntarily; however, testing is still encouraged until a vaccination or if you have been on a trip.