Hi

There is no such cutoff mentioned for BHUPET forensic science yet. Counseling of BHUPET has started, if you have qualified the exam then there will be a call letter for you and during counseling you can fill your choice as forensic science. 

For more information you can go through this link 

https://www.google.com/url?sa=t&source=web&rct=j&url=https://university.careers360.com/articles/bhu-pet-cut-off/amp&ved=2ahUKEwjv07uPo6rjAhUFl48KHQmbBfYQFjAKegQIBRAC&usg=AOvVaw3Fws9cf1mNJwzCL5XX4XwZ&ampcf=1

Hope it helps.