The discovery process allows litigating parties to collect and consider all pertinent facts, to use those facts to assess the strengths and weaknesses of their case and to otherwise prepare for trial. A general exception to the requirement to disclose relevant documentation and information during the discovery process relates to documents or information that are “privileged”.
The recent decision of the Chief Justice of the Tax Court of Canada in CIBC v. The Queen (2015 TCC 280) is an excellent review of the strict rules surrounding privilege in this context, and a cautionary tale for litigants taking an overly obstructionist approach to the principles of full and proper disclosure.