Section 157(2) in The Code of Criminal Procedure, 1973
(2)In each of the cases mentioned in clauses (a) and (b) of the proviso to sub-section (1), the officer-in-charge of the police station shall state in his report his reasons for not fully complying with the requirements of that sub-section, and, in the case mentioned in clause (b) of the said proviso, the officer shall also forthwith notify to the informant, if any, in such manner as may be prescribed by the State Government, the fact that he will not investigate the case or cause it to be investigated.