This is a hard one. Each jurisdiction does things a bit differently. The one constant to remember in a crime novel is the role of the coroner/coroner investigator. Here in Clark County, Nevada, there are about 20 "coroners." While CSIs may arrive on scene and start photographing, neither they nor detectives can touch the body…that includes looking for ID. The body belongs to the coroner, the crime scene to the CSIs, and piecing together "who done it" is largely the job of detectives. So if you read a murder mystery that makes no mention of the coroner…..expect more flaws to follow.