For a screenplay idea, I wanted write a murder where the police investigate it and conclude that the evidence was planted. Basically supposed killer suspect is framed, and the police catch on. Therefore since it's concluded that he was framed, no charges are laid against him. However, I got some negative feedback from readers, and they said that they found it unconvincing that the police could tell it was a frame. Basically the framer got the suspect he wanted to frame, at gunpoint, to spit on the dead body, and bleed on it. Leave hair, things like that. But the cops are able to tell by going over the crime scene, that the physical evidence was planted after, and possibly by someone forcing them to do it. Now I did not go into great detail on this in the forensic experts dialogue explanation of it. Perhaps that's the problem. I am not sure how to go about this one though. I bought the book Forensics, for writers, by D.P. Lyle, but so far I don't think it's been the best help. It can you a lot of things, but not how to identify a frame particularly. Any ideas on how I could approach this one? Thanks for the input .