When a crime scene investigator arrives at a crime scene he or she must 1. secure the crime scene 2, document the crime scene 3. evaluate the possibilities for finding answers to basic questions such as, “where did the crime occur? ” and, “are there signs of a struggle? ” before that, he or she has to 1. secure the crime scene 2, document the crime scene 3. evaluate the possibilities to ensure that no one disturbs the crime scene.