PredPol is a precrime system written by a mathematician (an assistant professor of math and CS) which recommends where police officers ought to patrol. [2] PredPol was deployed in Santa Cruz and Los Angeles, CA.
This is not fiction.
[0] https://web.archive.org/web/20100603031047/http://www.dhs.go...
[1] https://www.nature.com/news/2011/110527/full/news.2011.323.h...