As a long time veteran of a police dept much larger than either of those in this story, I can tell you that there is little chance this is a good portrayal of the way these cases unfolded.
The whole bit of the super-driven detective bossing around a bunch of subordinates like a kindergarten teacher is horrible, Hollywood schlock. Detectives that work cases do not dress down a uniformed officers, and are not called "Detective" by their peers. Telling a uniformed Sgt (a supervisor who would outrank her) how to conduct his team? Never.
Netflix has a pattern with this. Mindhunter, and the Ted Kacyznski Manhunt show, are wildly fictionalized. The crimes may be accurately portrayed, but the people involved in the investigations are mostly romanticized, drama-injected fictional characters.
This has to be the same bit, as "detectives" like this just don't fly. Its how the writer wants the story to look.
Review of Unbelievable
