Actually, according to the MSAR 2009-2010, there are five schools that don't have a secondary application. They are Mayo, UMDNJ-RWJMS, UTMB, UT-Houston, UT-San Antonio. Unless you are applying to these schools, expect a secondary. Plus, there are some schools that will screen you prior to your secondary so the ones that they will formally discuss are those who only get the invitation to fill out the secondary.