It is very important to maintain the integrity of a crime scene. During a major crime investigation (such as a homicide or shooting) Crime Scene Investigators need be as thorough as possible – they need to protect the scene and the evidence as well as create a safe zone to conduct their work. Outdoor crime scenes provide specific dilemmas to Crime Scene Investigators. Oftentimes an “outer perimeter” is taped off using yellow crime scene tape to keep the public out, protect the area and to protect any evidence contained within the area.
A second area, the “inner perimeter” keeps officers and other emergency personnel out of the identified crime scene and helps protect evidence from being destroyed. All persons entering and exiting must be logged in and out. Once the Crime Scene Investigator and the Detectives have finished their investigation the area is re-opened to the public.