Section 189: Restriction on disclosure as to source of information in respect of commission of offences.

No magistrate, police officer or any other public officer authorised to investigate or prosecute offences under any written law shall be compelled to disclose the source of any information as to the commission of an offence which he is so authorised to investigate or prosecute and no public officer employed in or about the business of any branch of the public revenue, shall be compelled to disclose the source of any information as to the commission of any offence against the public revenue.