The Park County Police Force are a heavily featured group within the series, lead by Sergeant Yates, although many other officers appear throughout the series. Introduced in Season Seven, it superseded Officer Barbrady, the South Park Police Chief as has since remained the core police force in the series. In "Cartman's Incredible Gift" he hires Eric Cartman for his supposed psychic powers but ends up solving the case of the left-handed serial killer Michael Deets by himself.