I can't speak for other first world countries, but Canada has its share of police misconduct. The most recent example is the mishandling of the 22-person killing spree in Nova Scotia[1], and the Toronto police are so famously bad at investigating sex crimes and protecting victims that an entire book was written on the subject[2].

[1] https://www.vice.com/en/article/canada-police-mistakes-novia...

[2] https://www.amazon.ca/Story-Jane-Doe-Book-About/dp/067931275...