How is this 3-year option possible? Why isn’t the MD degree three years for all students?

We have LCME (accrediting body for US MD programs) endorsement and Arizona Board of Regents (ABOR) approval for this innovative curriculum. It is made possible with careful planning at specific sites where there is need, matched with the capacity to provide excellent training to medical students in this model. The 3-year curriculum is focused on primary care specialties.