[xashor]

As far as I know, only parliamentarians enjoy immunity in Germany, though the parliament can detract this right from its members. But just because police/judges/… can be prosecuted, does not mean they will; in reality, only a handful of police officers and judges get convicted (mostly only when they do illegal stuff outside their job). And if they get convicted, there is hardly any penalty. People keep their jobs, maybe pay some fine. That's no surprise, the police investigates itself, and of course nobody likes to speak against their comrades. Also, law enforcement, law maker and the court system tend to be friendly to each other.

I heard the Netherlands and Britain have a better system, where an independent party investigates accusations against police officers.