I have a question about crime scenes. In my story, two people were murdered in their home. Once the authorities are called, how long does it take to gather photographic evidence of the bodies before they are removed from the scene? And how long would the police mill around the scene after the bodies are taken away? The reason I ask is because I have a character who needs to return to the crime scene as soon as possible, but when no one is around. If the murders happened in the early morning, by when would all the police activity have died down?
Also, basically anything on police procedures regarding homicides would be extremely helpful.