Every year about this time in the fall a bunch of us Stanford medical types get together to evaluate potential med school applicants. Physicians, surgeons, nurses, students, and other assorted folk assemble to spend hours interviewing each of these brightest and best who had just flown in from all over just to have us look them over.
Essentially the process is impossible, or nearly so. We receive 7,500 applicants for 90 slots. We interview 400, from whom 140 are selected. 90 will eventually matriculate. So by the time we get to interview the candidates they have already passed through major filters.