This thread raises some interesting questions for med school applicants. It is considered "standard" that applicants "waive their rights" to see copies of their LOR's, and presumably that is to assure the med schools that the LOR writers provide them with candid and truthful assessments of the applicants.
That may be true to a degree, but frankly I'd be wary of waiving my right to see a copy of any LOR I asked someone to write for me. And I'll tell you why I feel that way.
I applied to med school over 30 years ago and my UG school has a pre-med committee that provided a composite pre-med committee LOR. I asked several of my UG science profs to write LOR's to be put into this committee letter. I prefaced my requests to write a "good supportive" letter and told them that if they couldn't do that I'd rather not have them write a letter for me. Five profs agreed to write letters, and they were all in basic science courses (bio and chem) for which I'd gotten grades ranging from A- to A+. My UG GPA was 3.8 and my MCAT was 12/12/13, so I figured I ought to be a competitive applicant.
Well, my first round application led to 6 interviews and no acceptance. At one of my interviews an interviewer made an offhand comment about my LOR...
Sometime later I happened to get hold of a copy of the committee LOR... All of my profs, save one, wrote very good supportive letters. One of them, however, wrote a rather nasty and derogatory letter. He did give me a solid A (for O-Chem). Thinking back on that course, I realized that I'd argued with him in class about the subject matter, and apparently it must have rubbed hum the wrong way. The only thing I can imagine is that he really didn't like me. He had to give me an A because of my exam scores, but I guess that he must have felt it was his duty to screw me out of getting into med school. For all I know, he might have been a frustrated med school applicant himself.
I chose to go to Italy for two years, and came back to the US to reapply to US schools. But before I did that I went back to see my old pre-med advisor. I exercised my right to remove letters from my committee letter before they sent it out again. I told him that I wanted Prof. X's letter taken out. He looked over the original letter and said nothing except "Good choice!"
On the next round I applied to just 5 schools, got interviews for 4, got accepted at 3, and enrolled in my first choice school.
My point is that LOR's are a serious issue for the med school applicant, and even if you ask your Prof's to write a "good letter," there's always the possibility that some alpha-hotel can screw you over.