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Steps to Becoming a Crime Scene Investigator (CSI) Although there are varied paths to becoming a crime scene investigator, becoming one typically involves a mix of rigorous coursework and empirical (i.e., on-the-job) training either through a law enforcement agency or various internships at companies, laboratories, and other forensic facilities. Jan 16, 2020 · Hair DNA testing is carried out to check for paternity and forensic investigation. In a forensic laboratory, the governing bodies have their way of extracting the DNA successfully in a given hair sample. They have the best testing techniques and resources. Usually, in a crime scene, the hair sample does not have the roots attached to it.