Our Role Service Charter The Office of the Director of Public Prosecutions (DPP) is the independent prosecuting authority for the State of Western Australia, responsible for the prosecution of all serious offences committed against State criminal law. A separate body - the Commonwealth DPP - prosecutes offences committed against Commonwealth criminal laws. The DPP acts independently of the Government in decision making on criminal prosecutions. The DPP is however responsible to the Attorney General for the operation of the Office. The DPP does not investigate crime - that is the role of investigating agencies such as the WA Police Service and the Corruption and Crime Commission.