The assassination attempt on Trump has shifted attention to the complex challenge of securing large-scale public events in open spaces, such as King Charles' coronation ceremony, the Paris Olympics and election rallies across the U.S.
David Douglas, a retired California law enforcement officer with over 30 years of experience and affiliations with FBI Infragard, NYPD Shield and the Terrorism Early Warning Group (TEWG), explains: "The first challenge in securing election rallies that include public appearances by a sitting president or presidential candidate in front of tens of thousands of citizens in an open area is to define a sterile zone and perform screening for every person found or entering the sterile area, days before the event itself. This ensures that no people who might pose a danger, and no weapons or bombs, enter the sterile area."
