Hi aspirant,
First of all I would like to add that your choice of forensic science is great. This profession is increasing day by day and yes its a credible sector too. There is no such respective criteria to be selectively choosing a student out of the same state of the institution.
The basic criterion of eligibility for admission to the course, is a Higher Secondary (10+2) or equivalent qualification from a recognized educational Board, with Physics, Chemistry and Biology and/ or Math as main subjects and a minimum aggregate score of 55% or some colleges have their cut off lists for this course's admission procedure to be followed.
However, a few private universities in India conduct their own entrance tests for evaluating and admitting students to the course.

Good luck
Hope it helps