Without prejudice to the provisions of Section 197 of the Code of Criminal Procedure, 1973 (2 of 1974), no prosecution under this Act shall be instituted except with the previous sanction, —
(a) In the case of a person who is employed or was at the time of commission of the alleged offence employed—
(b) In the case of a person other than referred to in clause (a) of the State Government.