Nowadays Forensic Science is taught at Masters level in some of the universities of India. However, you have not studied Forensic Science at Masters level. You have done your Doctorate in Biotechnology. So, prima-facie, you are not eligible to teach Forensic Studies in College/University level.
However, as far as I know, Forensic Science is an inter-disciplinary subject. Biotechnology is an essential part of Forensic Studies. So, I feel that with your qualification (PhD in Biotechnology), you would be eligible to apply for the post of Assistant Professor/Lecturer in this subject (Forensic Science).
Beware! I question everything and everybody.