The first rule of any locus is to preserve it and therefore it quite strictly off bounds to anyone except those that are required to go and inspect the death. Therefore the first police officer(s) at the locus has the responsibility for initiating scene preservation procedures [Saferstein, 2001]. This includes setting up road closures, establishing cordons, initiating scene logs and in some cases noting environmental points as evidence can be compromised due to change of weather conditions. They also, whenever possible, gathers information from witnesses, emergency personnel, and bystanders and try to get a description of what happened or anyone saw the individual or vehicle that was responsible. This information is important for different reasons. It helps to establish the outer perimeter of the scene, and it assists in determining the series of events that may have occurred.
Various other expertises all work at the locus as well such as the pathologist, the Prosecutor Fiscal, photographer, the toxicologist and the crime scene investigator, who is the main person that decides who gets to go into a scene and in some cases establishes an entry and exit path for the period of the scene examination [Saferstein, 2001].
Everything must be noted all the experts have a vital role of recording all the procedures that are done and documentation for every expert is required to be competed for future reference that