Section 166

If a book or document which is in evidence or is liable to inspection in any civil or criminal proceedings whatsoever contains any entry in which any informer is named or described or which might lead to his discovery, the court shall cause all such entries to be concealed from view or to be obliterated so far as may be necessary to protect the informer from discovery.

If in a trial for an offence under this Act or its subsidiary legislation the court, after full inquiry into the case, is of the opinion that the informer wilfully made in his complaint a material statement which he knew or believed to be false or did not believe to be true, or if in any other proceedings the court is of the opinion that justice cannot be fully done between the parties to the proceeding 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 an inquiry and require full disclosure concerning the informer.

Manner of service of documents