Television has glamorized a number of fields in forensic medicine thus leading tech schools to offer certificates in some of them. A physician who specialized in medical forensics has an undergrad degree, a medical degree and a long residency. Most of the better paying jobs require at least a BS.
Medical forensics is a field that requires extensive medical knowledge. How do you think they would allow you to perform an autopsy without a medical degree? If you have your heart set on the field of forensics i would suggest the regular kind. unlike medical forensics, regular forensics likely only requires the study of criminology.
Yes. Most college's will accept students with a background in biology, anatomy, or chemistry, because those are the primary disciplines they base their work from. The pre-med programs just help you to make sure you have all the relevant coursework completed so you can be successful in the medical forensics program.