Speaking to an audience at the May 2009 annual conference of the American Psychiatric Association, Carpenter said: We had hoped to get rid of schizoaffective as a diagnostic category because we don't think it's valid and we don't think it's reliable.
Puhuessaan toukokuussa 2009 Amerikan Psykiatriliiton vuosikokouksessa Carpenter lausui: "Olimme toivoneet pääsevämme eroon skitsoaffektiivisesta diagnoosina, sillä emme pidä sitä kunnollisena emmekä luotettavana.