In contrast microscopic crime scene are small such as

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In contrast, microscopic crime scene are small, such as the immediate area around the body or just the body. In the case of computer crimes, if a file is stolen from a computer’s hard drive, then the crime scene may exist entirely within the computer that was accessed illegally. The environment in which the crime occurred affects the investigation. The crime may have been committed outdoors, indoors, in a private vehicle, or on public transportation. It may not be possible to assign a very specific geographic location to the crime committed on this bus.
What is the role of first responders?
Who shows up at a crime scene?
Police officers are first responders who secure the area and protect evidence. Detectives , who are members of the police force, interview witnesses and interact with crime scene investigators. Paramedics render medical assistance to those injured. District attorneys determine whether a search warrant, a legal document that authorizes the search and investigation, is needed. Medical examiners or coroners perform an initial examination to determine cause and time of death for a homicide. Crime scene investigators document the area and search for evidence. Special forensic scientists (such as forensic entomologists, who study insects to determine time of death) may be called in when necessary.
Learn: Crime Scene Procedure Police secure the area to preserve evidence. There is no single procedure for investigating a crime scene. However, most crime investigations follow similar patterns. The first responders must render aid and notify others, such as criminal investigators. Next, police officers briefly investigate the scene and secure it from unauthorized personnel— a step that's necessary to preserve evidence. Recall that Locard’s exchange principle indicates that anyone in contact with the crime scene leaves and removes traces of material. The officers must keep a log of who enters and exits the crime scene.

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