The point is that the police departments face constraints (budgetary, management, laziness, etc.) such that many crimes and police reports simply are not invest

The point is that the police departments face constraints (budgetary, management, laziness, etc.) such that many crimes and police reports simply are not investigated at all. Some first hand examples: The four times my car was stolen, no investigation or arrest, including the one time I even was able to give them the name of one of the people who did it. Usually they don't explicitly announce these policies because they are unpopular, but every police department has some threshold beyond which they do nothing.