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When the BC Supreme Court Rules, BC Reg 221/90, were repealed and replaced in 2010 with the BC Supreme Court Civil Rules, BC Reg 168/2009, and the BC Supreme Court Family Rules, BC Reg 169/2009, the editors of the BC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.
- British Columbia Motor Vehicle Accident Claims Practice Manual, §4.3B Relevance (available in print or online in most BC courthouse libraries)
- Discovery Practice in British Columbia, §2.18 "Documents...Relating to Any Matter in Question in the Action": The Question of Relevance (available in print or online in most BC courthouse libraries)
- Personal Injury for Legal Support Staff, 2011, "Document Disclosure Obligations under Rule 7.1" (available in print in Vancouver or Victoria Courthouse libraries, or via CLE Online in all BC Courthouse Libraries)
- British Columbia Annual Practice, "Procedural Guide", p. xxxv (available in print in most BC Courthouse Libraries