Police Brutality: Usually averted, day to day, as the Watch Constabulary is very well trained, highly disciplined, and – as the instrument of force that is legally permitted to apply it, law for the enforcement of – rigorously monitored and audited to make sure that it’s doing it properly. Especially where the rights of the accused-and-therefore-not-yet-determined-to-be-guilty are concerned.
Played straight in a lethal, although not any other, sense inasmuch as the Empire, in general, maintains a very broad right of self- and other- and property defense where the regular citizen-shareholders are concerned – which is to say, there isn’t a reasonable force doctrine and you can shoot at criminals to protect any of those – and while the police are somewhat more restricted in that they’re obliged to try and arrest you, they aren’t actually any more restricted than regular citizen-shareholders where preventing crimes in progress are concerned if you are unwilling to be arrested. Criminals caught by the Constabulary in the commission of a crime are advised to surrender immediately, for this reason.
Subverted where riots, occupations, and suchlike are concerned, inasmuch as Imperial law classifies these sorts of things as “insurrection”, and while the police won’t be brutal, that’s because insurrection is a military matter – and the situation will therefore be handled by people for whom “arrest” is outside their job description.