It's not the technology that is snake oil, it's the way it's marketed. Machine learning that predicts where crime might occur is fine. But knowing that isnt going to help any more than just knowing certain neighborhoods are at higher risk.

Then you get into the predictive policing issues if you make this more granular down to individuals. Stuff like a lack of reasonable suspicion or probable cause because police belive the BS sales pitches and take it as truth.