No Police Officer shall receive any complaint of any petty offence; or take into his custody any person brought to him accused of such petty offences, trespass, assault, quarrelling, or the like; and it shall be lawful for any Police Officer to refuse to receive any charge of an offence of a grave character, if he shall on enquiry made of the complainant alone, see good grounds for doubting its truth:     Proviso.- Provided always that, if the charge be not of such a nature as under ordinary circumstances would justify the Police Officer in refusing to receive it, the particular reasons for refusing it are to be recorded by such Officer at the time.