Civil Service Personnel Rule 184

184. If it is necessary to make the preliminary enquiry, the head of the relevant Ministry and the service personnel organization may form the Preliminary Enquiry Board and assign duty as prescribed in Form (3) according to the rank of the service personnel who is taken action. To facilitate the formation of the Preliminary Enquiry Board, the authority to form the Preliminary Enquiry Board may be conferred as appropriate according to the service personnel organization. In forming the Preliminary Enquiry Board:
(a) the board shall be comprised with the total number of three members-the chairperson and the other two members. The members of the board shall be superior in rank to the service personnel who is taken action;
(b) if it is necessary to appoint the service personnel from the other organization in the board, it may be done in coordination with the relevant service personnel organization;
(c) the members of the board shall not be the persons who have personal interest in the case, who are directly or indirectly involved in the case, who are personally concerned or who are malicious persons in respect of the case to be enquired;
(d) the order of formation of the Preliminary Enquiry Board shall be sent to the chair person and the members. In such order, the facts to be enquired into shall be described and if necessary, the summary of the case shall be attached. In addition, the relevant documents, accounts and complaint letter, if any, shall be attached. The date on which the Preliminary Enquiry Board has to submit enquiry report shall also be fixed exactly.