Section 26

If any book, document or paper which are in evidence or liable to inspection in any civil or criminal proceedings contain any entry in which any informer is named or described or which might lead to the discovery of the informer, the court shall cause all such passages to be concealed from view or to be obliterated so far only as may be necessary to protect the informer from discovery.

If in the trial for any offence under this Act or any regulations made under the Act, the court, after full enquiry 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 opinion that justice cannot be fully done between the parties thereto without the discovery of the informer, the court may require the production of the original complaint, if in writing, and permit enquiry and require full disclosure concerning the informer.

Evidence of agent provocateur admissible