OTTAWA — Provincial rules around alcohol and the federal government’s “Buy Canadian” policy have been flagged in a new report citing several trade irritants between Canada and the US. The annual document prepared by the Office of the US Trade Representative said market access barriers imposed by provincial liquor control boards “greatly hamper” exports of US wine, beer and spirits to Canada. …The report says U.S. companies have reported concerns about barriers in competing for contracts, including proving their Canadian subsidiary’s independence from a US parent company. Other issues listed in the report include delays with aircraft validation in Canada and high tariffs on U.S. dairy products. …Canada is still being slammed by Trump’s separate tariffs on industries like steel, aluminum, autos, lumber and cabinets. The Trump administration has launched investigations of a long list of countries, including Canada, citing forced labour in supply chains.