CSI: Crime Scene Investigation physical evidence to solve murders. The team is originally led by Gil Grissom (Petersen), a socially awkward forensic entomologist and career criminalist who is promoted to CSI supervisor following the death of a trainee investigator. Grissom's second-in-command, Catherine Willows (Marg Helgenberger), is a single mother with a cop's instinct. Born and raised in Las Vegas, Catherine was a stripper before being recruited into law enforcement and training as a blood-spatter specialist. Following Grissom's departure during the ninth season of the series, Catherine is promoted to supervisor. After overseeing the training of new investigator Raymond Langston (Fishburne), Willows is replaced by
CSI: Crime Scene Investigation depiction of police procedure, which some consider to be decidedly lacking in realism. For instance, the show's characters not only investigate ("process") crime scenes, but they also conduct raids, engage in suspect pursuit and arrest, interrogate suspects, and solve cases, all of which falls under the responsibility of uniformed officers and detectives, not CSI personnel. Although 'some' detectives are also registered CSIs, this is exceedingly rare in actual life. It is considered an inappropriate and improbable practice to allow CSI personnel to be involved in detective work, as it would compromise the impartiality of scientific evidence and would be impracticably