I can't stand Lewis, so I feel Swinton is wasted in those films (Medusa mudcake hairdo included).

Medea as a police procedural would be the Andrea Yates story. Interestingly, city-states had police: the Spartans had the skotia (though its primary use was assassination of uppity helots), the Athenians actually employed Scythians (on the sound premise that they would be more impartial).