Most probably, the police gets fewer cases because fewer are reported. For example, the rape that is topic here will not be noted because an official crime needs an official convict. Places like New York are lawless areas, guides tell tourists to not to go outside in the dark or visit certain districts.
Police has been strengthened in the mid 90` both in numbers and methods but crime rules the cities with an even harder grip.
In Detroit, it is a big event, when there are 36 hours without a murder.
Detroit goes 'murder free' for 36 hours
