We are asked by the RCMP to assist in specific criminal investigations, and the need to retain information depends on the period during which the activities transpired. In forensic accounting, it's preferable to have access to as much financial information as possible in order to build a financial picture of the individual or company, establish the source and use of funds, and track their movement and the manner in which they flow from one account to another.
On February 28th, 2018. See this statement in context.