3 needed to calculate an average
If you got fooled into believing that Dispatch!! is actually a detective manga by the first 4 translated chapters (which it is not, because it is a H manga) and now you want to read a manga with strong female lead who also happens to be a police detective, then you ought to read Psychometrer Eiji.
The first 4 chapters of Dispatch!! are very similar to Yakushiji Ryouko no Kaiki Jikenbo, so if you want more of female + male detective due you should go read Yakushiji Ryouko no Kaiki Jikenbo right now. As for the rest of Dispatch!!, you'd better of staying as far away from it as you can...