Really? This is what is on the current site:
For application to the Doctor of Medicine Program you will submit the contact information for two referees as part of the Secondary Medicine Application. Please only select individuals (ie. coach, co-worker, employer, leader of volunteer organization or club, professor, supervisor, research supervisor, teacher, etc.) who know you in a supervisory or professional capacity and who presently know you well enough to speak to your moral and ethical character.
Your referees will be contacted later on in the application cycle to complete their reference letters in the form of a series of standardized questions.
Referees absolutely cannot be relatives, family members, friends, close family friends, or personal physicians.