I have been calling adcoms about LORs and what they explicitly want in terms of science/non-science recs. It turns out for most schools your pre-medical evaluation will suffice. This means if you follow the rules for the pre-med committee eval. at your own school ( ie # of science to non-science etc.) you should be ok. i am a little worried because I only have one faculty science letter(which is ok at my school) and some schools are looking for more. Apparently this is no problem if you are sending a Pre-med Committee Eval. However, if you are sending individual letters you must abide by the number of science recs. Hope that clears up any confusion!