Please don't listen to vickpick. Vickpick spouts a lot of incorrect info b/c he/she hasn't applied to med school yet (as apparent from other posts), AND thinks residents don't yet have an M.D.:
http://forums.studentdoctor.net/showthread.php?p=8182595#post8182595
As someone who already applied to M.D. and D.O. programs...
1) The only med school that I know of that requires shadowing is Utah--and even then, if you are competent in 5 out of 6 fields, you *might* be able to get away without doing it. Other schools just look at shadowing as any other EC--it's good to have EC's that reflect your knowledge about and commitment to medicine, but it
isn't A REQUIREMENT.
2) Half of the D.O. schools are the institutions that mandate shadowing a dr. to be accepted, and they mandate a D.O., obviously. The other half (my application proves) accept M.D. shadowing.
3) There were one or two M.D. schools that requested/strongly suggested a professional LOR and/or simply had a statement that any "optional" professional LOR's would not be beneficial if from: a family member, your own treating physician who you haven't shadowed, a dentist, a physicians assistant, medical student, or a nurse...no mention of D.O. and no mention of residents or fellows. Basically they don't want the equivalent of PERSONAL REFERENCES. A resident is in a position to evaluate you outside the scope of offering a personal reference.