For that, you can look at France for example:
Some times ago, there use to be constant demonstrations against the government in Paris. The police governor of the region requested police to do a lot of harmful and possibly unlawful actions and tactics. Resulting in a lot of casualties (broken eyes, concussions, ...) And more trouble as the strategies were forcing people in more aggressive and violent positions that they would have been.
All of these methods were previously forbidden especially because it was known to be harmful and against civil rights.
Still they continued without conséquence as they said that "they are the police, they can decide what is the understanding of the law".
Same things for the police using "drones" to monitor civilian without authorization. But still, no consequence...