For appointments in officers posts in police department one has to appear and qualify in state level service commission or Indian Police Service for which age is also a crucial criterion. That you have to see whether it is feasible in your case.
Anyway as you have already got a teaching experience so teaching line is one of the best options for a person having done PhD. Here you can progress to higher levels and can guide the postgraduate students for their PhD. You can even consider applying to other universities or institutes if you get a chance for higher post elsewhere.
There are many colleges/ universities where this subject is taught. Some of them are -
1. Madurai Kamaraj University, Madurai
2. Annamalai University, Cuddalore
3. Manonmaniam Sundaranar
4. University of Kerala,
5. Guru Nanak Dev University, Amritsar
Knowledge is power.