Sliding Scale of Law Enforcement: Standards vary acutely, depending on where in the Worlds you are. The Empire’s Watch Constabulary and the PPLs signatory to the Warden-Bastion Compact occupy the idealistic end of the scale (well, one idealistic end of the scale, since they’re perfectly happy to shoot people who won’t surrender if they’re caught in the middle of their special crime) with their great, great respect for individual rights and people’s lack of guilt until formally convicted, willingness to wade in and help out, and generally go above and beyond.
The other end of the scale is, as usual, Nepscia and its fellow Wretched Hives – where “law enforcement” generally means “the biggest brute squad in the vicinity”. Various more authoritarian states and less scrupulous PPLs occupy the wide, wide middle ground, here.
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.
Instant Emergency Response: As a side effect of the AI monitors on the raw feed mentioned under Big Brother Is Watching, which both make sure response is dispatched to observed crimes and accidents as they happen, and which are happy to use predictive algorithms to make sure that it’s in place before they happen; and inasmuch as the various emergency services have widely distributed robot hotels to make sure that they can at least get cybershell feet or wing on the ground very rapidly, emergency response is very rapid, and most of the time, you don’t need to explicitly call it in if you’re in public.