(1) Except as hereinafter provided, no witness in any civil or criminal proceedings under this Act shall be obliged or permitted to disclose the name or address of an informer, or the substance of the information received from him, or state any matter which might lead to his discovery.

(2) Subject to subsection (3), if any books, documents or papers, which are produced in evidence or liable to inspection in any civil or criminal proceeding under this Act, contain any entry in which any informer is named or described or which might lead to his discovery, the court shall cause all such passages to be concealed from view or to be obliterated, but only to the extent necessary to protect the informer from discovery.

(3) If on trial for any offence under this Act, the court, after full enquiry into the case, believes, that the informer wilfully made in his complaint a material statement which he knew to be false or did not believe to be true, or if in any other proceeding the court is of opinion that justice cannot fully be done between the parties thereto without the discovery of the informer, it shall be lawful for the court to require the production of the original complaint, if in writing, and permit enquiry and require full disclosure concerning the informer.