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Criminal investigators have a long list of duties. They must identify and secure a crime scene, conduct interviews of witnesses and victims, interrogate suspects, identify and properly collect evidence, and establish and maintain a chain of custody. Once an investigation is underway, the criminal investigator must demonstrate thorough knowledge of investigative techniques for misdemeanors or felonies and for violent or nonviolent crimes. The criminal investigator must also accurately and unbiasedly document each step in the investigative process as well as be proficient at testifying in a trial.