Whenever the National Director has reason to believe that any person may be in possession of information relevant to the commission or intended commission of an alleged offence in terms of this Act, or any person or enterprise may be in possession, custody or control of any documentary material relevant to such alleged offence, he or she may, prior to the institution of any civil or criminal proceeding, under written authority direct that a particular Director of Public Prosecutions shall have, in respect of a specific investigation, the power to institute an investigation in terms of the provisions of Chapter 5 of the National Prosecuting Authority Act, 1998.