https://apnews.com/5abbbf84824217c232535ee76717bb4b > TORONTO (AP) — Canada is introducing a contact tracing smartphone app that will notify Canadians of exposure to the new coronavirus. > Prime Minister Justin Trudeau said Thursday the app will be voluntary and that if someone tests positive, other users who have the app and have been in proximity will then be alerted they’ve been exposed to someone who has tested positive. Trudeau said privacy will be respected.