
Because of the digital age, readers are more savvy about crime investigations, particularly murder. C.S.I. and Criminal Minds provide plenty of forensics and behavioral analysis to make armchair experts of most of us. Consequently, it creates a wide spectrum for writers when it comes to deciding how much is too much and how much is not enough. Personally, I don't think there is a hard and fast rule. Go with your gut! Whatever you feel enhances the story line or broadens the scope of your characters is the right choice.
The bottom line is that writers and readers are not different from each other. Most readers just want to be carried along by the characters, feeling what they feel, and to exist in their worlds for a short period of time. Writers want the same thing. If we can come together in a special experience called a novel, well then …