CSI is an innovative, new type of crime drama because the characters use cutting-edge forensic tools to examine the evidence to solve the case. Rather than a 'whodunnit' cop show (investigating witnesses/suspects), CSI explores the 'howdunnit'.
Season 11, Episode 1 - Shock Waves Langston fights for his life after being stabbed by psychopath Nate Haskell, while the other CSIs attend a funeral that turns deadly.
Season 11, Episode 3 - Sqweegel The CSI team investigates a mad slasher who strikes without leaving a trace - because he wears a form-fitting black latex suit that leaves not a molecule of evidence behind.