Forensic Chick, I have to disagree with the required law enforcement experience and criminal justice courses (I am not trying to start any trouble or anything). I am currently employed at a crime laboratory. The majority of my collegues have science specific degrees (biology, chemistry, medical technology, etc) with no prior criminal justice experience or course work.
Forensic jobs are hard to come by, but I agree with you that it is very rewarding. For those interested in DNA positions, biochemisty, molecular biology, genetics, and stats courses are required. Check out American Society of Crime Laboratory Directors website, they usually have job listings.