The last time the Auditor General visited advertising and POR was in February 2007. Here's the conclusion:
1.84 In our current audit, we found that PWGSC has made satisfactory progress in ensuring that it awards contracts for advertising and public opinion research services in a fair and transparent manner in accordance with the Treasury Board's Contracting Policy. 1.85 Departments have made satisfactory progress in ensuring that planning for advertising activities and managing suppliers is done in accordance with the Communications Policy of the Government of Canada. 1.86 The government has made satisfactory progress in ensuring that there was adequate documentation to support invoices submitted for payment for advertising and public opinion research activities. 1.87 The results of advertising and public opinion research have been measured and reported in accordance with the requirements established by the Communications Policy of the Government of Canada.
That was in 2007, and we haven't had an audit since that time.