PHOENIX (AP) — The University of Arizona as a “last-ditch effort” will ask students to voluntarily shelter in place for the next two weeks, University President Robert Robbins said. He cited a troubling uptick in positive cases among students.PHOENIX (AP) — The University of Arizona as a “last-ditch effort” will ask students to voluntarily shelter in place for the next two weeks, University President Robert Robbins said. He cited a troubling uptick in positive cases among students.