Just calm down and take it easy when cops coming, because you did nothing wrong at all...., I agree with this guy, you should always keep silent until you talk to your lawer about the case.
it depends on what situation u are ,what do u do ? who are u? a canadian citizen ,a immigration , a student , a illegal immigration , a criminal ,and what kind of police u meet ,a traffic controller , a detective , a SWAT? what language level u have , fluents or hesitate ,or u donot know any english .
police have rules ,they must secure everybody whatever u are a hostage or terrorist , when police get in they will cuff u , it is for officer's safty , it is diffirent with chinese police , u should watch the show COPS then u will know .
加国生活：您被警察碰上了，怎么办？