In Canada, what process is used to check the power of law enforcement?

Here in the U.S., our system is completely useless: We do have civilian oversight boards in New York (I don't know about the other states) that supposedly investigate police misconduct impartially. However, officers routinely refuse to cooperate in the investigation; police unions have contracts that hinder any real accountability; the Boards do not have any subpoena or disciplinary powers; police officers threaten and harass people who file a complaint (that even some defense attorneys advise clients to just let it go) against them, police unions label these boards as anti-police, and the Boards submit their recommendations to the police commissioner, who can take disciplinary action against the officer, but the Board's recommendations are routinely ignored or dismissed. At best, the officer is assigned to desk duty temporarily or paid vacation.

What about in Canada? What is the procedure like over there?