I turned down a DO acceptance a year before I got into an MD granting institution. No one walks in this person's shoes, so try to not make such a rash judgement call on him. Regrettably, there still are differences between MD and DO programs, and especially between the different schools for each program type (RVCOM vs PCOM or WashU vs Morehouse). Is it possible to develop into a plastic surgeon from each route? I don't want to turn this thread into a MD vs DO thread, but just trying to tell you that each school is different, each program is different, each city is different, tuition is different, families factor into these decisions, etc.
I was totally transparent with my application history during my interviews the following year. I got into the school of my dreams, through EDP, and haven't ever looked back.
I don't regret it the slightest bit.
PS. This thread is full of complete lies. Be honest with the admission committee, in regards to your previous cycle and why you decided to pass on that acceptance. Also, your decision to turn down that acceptance does not infer that you "have a lack of commitment to attend medical school", or any other bogus claim that has been made above. It simply says that you didn't like the school, city, tuition, etc or had a personal/family issue that prevented you from accepting that offer. Simple as that. Medical school acceptances are an offer of acceptance. They are not some soul-binding agreement that you have to sign in blood, and you will be barred from any other institution if you fail to accept the offer in the first place.