Abstract
In scientific crime scene investigation, the first three activities at the crime scene are essential for the successful preservation of the physical evidence. The first responder sees the crime scene and the evidence before it has been altered or compromised in anyway. The first responder and ultimately the crime scene investigator have the obligation to make the scene secure and insure that any further activities at the scene do not change the evidence. The use of a multilevel security method will accomplish this task. The beginning of the on-scene activities occurs with the preliminary scene survey. The first identification of obvious physical evidence is done at the preliminary scene survey. Precautions for transient and conditional evidence are done at this step too. If there are special conditions at the scene at the conclusion of the preliminary survey can help identify any specialists that need to be called to the scene.
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