Just out of curiosity, is it possible to leave med school and return without starting over. For example, could a person withdraw after the first or second year and be gone for a couple years and return either at their original school or another school where they left off? Or, is it necessary to completely start over and re-apply if a person wants to return? Are all those classes good for nothing if you leave? I wouldn't matriculate if I planned on leaving, but was just wondering what the process was.