Say police place someone under house arrest. They are negligent and allow the person to leave and attack people.
Are police liable for damages, since they are required to protect people in their custody, and presumably also have to protect people attacked by people in custody? Otherwise, bizarre situation where police can only defend criminals.
In the US, police do not put a person under house arrest, instead, the courts do, as an alternative to standard imprisonment (either awaiting trial, or serving their sentence). The police are not involved at all; the courts cannot be sued for lenient sentencing. If a person leaves their house (even to buy a bottle of milk), they will have violated the terms of their more lenient sentence, and will be arrested and sent to regular jail. Generally, police are not liable for damages, especially when they fail to be omnipotent in their efforts to prevent others from doing wrong.
Supreme court ruling
a town and its police department could not be sued under 42 U.S.C. ยง 1983 for failing to enforce a restraining order, which had led to the murder of a woman's three children by her estranged husband.
https://en.wikipedia.org/wiki/Town_of_Castle_Rock_v._Gonzales
In general, all government agents have qualified immunity in executing their functions, in any manner they deem reasonable. There are limits to qualified immunity, e.g. felonies.
