All senior investigating officers (SIO) receive nationally accredited training that is based on the Core Investigative Doctrine in association with The National Police Chiefs' Council (NPCC). A key part of any investigation and something that is reiterated during SIO training is the detective's ABC principle- 'Assume nothing, Believe nobody, Challenge everything'. There is no set national procedure for the management of a case of dismemberment, but these basic ABC principles hold true and stand the SIO in good stead for a solid and productive investigation. The SIO will have separate plans and separate staff dedicated to specific areas of the investigation. The SIO was supported by an extensive team of officers and police staff, underwater search team, Evidence Recovery Unit (ERU), air support unit, national search advisors, forensic scientists, pathology and anthropology teams, clinical psychiatrist, family liaison officers, press officers and many others.