Each day, 400,000 Canadians cross the Canada-U.S. border. Beginning Oct. 17, more and more of those travellers could be forced to answer an uncomfortable question posed by wary American customs officers: Have you ever smoked pot?
Those who tell the truth risk being banned from the United States for life and might have to apply for special waivers in order to visit the U.S. in future.
https://www.cbc.ca/news/politics/tasker-smoke-pot-us-border-oct-17-1.4865696
