The "Peruvian Guano Rule" governs the establishment of relevance with respect to the disclosure of documents in an action and refers to criteria set in Cie Financière et Commerciale du Pacifique v. Peruvian Guano Co. (1882), 11 Q.B.D. 55.
When the BC Supreme Court Rules, BC Reg 221/90, were repealed and replaced in 2010 with the BC Supreme Court Civil Rules, BC Reg 168/2009, and the BC Supreme Court Family Rules, BC Reg 169/2009, the editors of the BC Annual Practice stated that one of the key features of the new rules was:
Limits on discovery - the scope of document production has been reduced and examinations for discovery are limited to seven hours, unless the court orders otherwise. Witness lists must be exchanged. Interrogatories are available only by consent or court order. The scope of document production has been reduced. Peruvian Guano is mortally wounded if not already dead.
- "Defending an Application for Production of Documents", British Columbia Motor Vehicle Accident Claims Practice Manual - onsite at Courthouse Libraries
- "Relationship between Rule 7-1 (1) and Rule 7-1 (11) to (14): The Question of Relevance", Discovery Practice in British Columbia - onsite at Courthouse Libraries
- "Document Disclosure Obligations under Rule 7.1" by Lawrence N. Robinson, Personal Injury for Legal Support Staff, 2011 - onsite at Courthouse Libraries
- "Procedural Guide", British Columbia Annual Practice - onsite at Courthouse Libraries