Nation Santa Clarita gunman used unregistered ‘ghost gun’ in Saugus High School shooting, sheriff says November 21, 2019 Kristin Lam, USA TODAY Comments Off on Santa Clarita gunman used unregistered ‘ghost gun’ in Saugus High School shooting, sheriff says An unregistered "ghost gun" was used in the deadly shooting at Saugus High School in Southern California last week, authorities said Thursday.