"[...] All the data they feed this system to predict crime comes from the cops, who are assumed to have some kind of bias, first because they're human and all humans have bias, and second because NYPD has a long history of getting caught in racial discrimination, which is why they're buying this stuff in the first place.

"Because cops only find crime where they look for it. If you make every Black person you see turn out their pockets, you will find every knife and every dime-baggie that any Black person carries, but that doesn't tell you anything about whether Black people are especially prone to carrying knives or drugs, especially when cops make quota by carrying around a little something to plant if need be.