It's a Crime

Crime Scene Investigation can be a bit of a mystery in and of itself for crime fiction authors who haven't worked in the field. There are several good sites out there that can help, such as the following Crime Scene Investigation resource. It includes a good overview, personnel duties and responsibilities, documentation procedures, and a wealth of articles on topics such as "Stringing a Crime Scene to Determine Trajectories," "Dead Body Evidence Checklist," "Proper Tagging and Labeling of Evidence for Later Identification," "Simple Crime Scene Sketching," and much more.  There are separate areas for fingerprints, footwear and tire tracks, computer forensics, human remains, and other grisly details not for the faint of heart. Even if you writing (or prefer reading) cozies, this can be a great way to learn more about what real law enforcement enforcement officers have to deal with at a crime scene, and not just what they show you on TV.