Here are the actual letters from the Charities Directorate of the Canada Revenue Agency to Canadian Lacrosse Association.

Here are links to CRA Press Releases and other CRA letters to registered charities and Registered Canadian Amateur Athletic Assocations (RCAAAs) that were deregistered for cause: CRA letters to charities for revocation for cause

Here is recent information published by CRA on RCAAAs including a list of registered and deregistered RCAAAs:

If you are wondering how should a registered charity or RCAAA issue official donation receipts then you might find this kit from CLIP helpful.