How is saliva collected at a crime scene?
I believe it is. It will show DNA to help find evidence and suspects to close the case!
Yes, there is the primary crime scene and the secondary crime scene. For example, if a body was found in a trash can but there is no evidence that the person was killed there then it means the person was killed somewhere else. The primary crime scene is where the person was killed and the secondary crime scene is where the body was dumped.