Ah policies. These documents that govern how governments, companies, and agencies conduct themselves can be very tricky to find.
The good news: the Internet, that fantastic information gathering facilitator, has made it so easy to publish, that sometimes you will find policies attached to the news releases that annouce they exist. See for instance the new Public Disclosure of Travel and Expenses Policy announced yesterday by the Alberta Government. The text of the policy is attached as a background document to the news release.
The only caveat to finding a policy in this form is that you will not likely be able to identify if the policy has been amended or abandoned, discarded or replaced when you find this 2012 new release in 2020.
Perhaps the Sunlight Foundation will come to Canada.