Why do many private schools interview in-state students at two or three times the rate they do out of state students (according to both US News and MSAR)? Tufts interviews 20 percent of in state applicants versus 10 percent OOS, Jefferson interviews slightly smaller percentages but still twice as many IS vs OOS, Einstein does the same, SLU interviews nearly 3 times as many, Drexel 3 times as many, BU twice as many. Many other schools do this as well. Is this to keep matriculation rates high? Is it because adcoms are more familiar with their undergraduate institutions? Is it some combination?