A police officer, whose conduct is under departmental enquiry, shall ordinarily be placed under suspension, when it appears likely that a charge will be framed which, if proved, would render him liable to reduction or dismissal, or when the nature of the accusations against him is such, that his remaining on duty is prejudicial to the public interests, or to the investigation into those accusations. Unnecessary suspensions should be avoided, as they increase the number of non-effectives, and also, unless the officer suspended is acquitted, involve under Fundamental Rule 43 the additional penalty, over and above the punishment awarded, of the substitution for pay of a subsistence grant.