I would assume because it is such a limited field when it comes to the amount of cases. Most of the research that I have found has been dentists with a strong law or general forensic background. Also, in California, it has been especially difficult for dentists and staff to get involved because of evidence tampering. Ever since the O.J. trial Calif. has cracked down on the handeling of evidence. This is just what I have found in my recent research and also in speaking to Dr. Sperber. It may vary from state-to-state. I am from Calif. so I have been looking into my opportunities in this field.