Inspired by this...
...a large Yautja(Predator Clan) ship lands somewhere in the woods of Michigan, and after a late night visit to the Governor's residence, the entire police force is replaced by Yautja!
These particular ones have been hunting on Earth for quite a while, so they do speak fluent American.
They will handle everything from parking violations to public order violations, criminal investigations, anti-terror and organized crime!
*The judiciary however, will be completely human.
We don't know why they're doing it, only that they might somehow be good at it(invisible parking attendant with homing disc-tickets...the bane of anybody who owns a car!)
They are on a 24-month trial period.
Can Detroit cope with YAUTJA POLICE DEPT?