CSI: Crime Scene Investigation (season 4) CSI: Crime Scene Investigation (season 4) The fourth season of "" premiered on CBS on September 25, 2003 and ended May 20, 2004. The series stars William Petersen and Marg Helgenberger. Nick accidentally leaks information to a news reporter ("Assume Nothing"), and Catherine tries to discover how a body ended up in a bathtub ("All for Our Country") during the fourth season of "CSI". Supervised by Grissom and Willows, the Las Vegas CSIs are tasked with investigating the bizarre, the unlikely, and the unprecedented, including a disappearing gun ("Homebodies"), the death of a baby during a heatwave ("Feeling the Heat"),
CSI: Crime Scene Investigation recruitment and training programs have seen a massive increase in applicants, with a far wider range of people now interested in something previously regarded as a scientific backwater. The ""CSI" effect" is a reference to the alleged phenomenon of "CSI" raising crime victims' and jury members' real-world expectations of forensic science, especially crime-scene investigation and DNA testing. This is said to have changed the way many trials are presented today, in that prosecutors are pressured to deliver more forensic evidence in court. Victims and their families are coming to expect instant answers from showcased techniques such as DNA analysis and