Facial recognition systems use artificial intelligence to analyze patterns in faces, and they've come under increasing scrutiny, particularly in policing. There have been multiple instances of false positives leading to the arrest and detainment of innocent people. There's no federal regulation of this technology, but at least a dozen states have laws that limit its use. So, some law enforcement authorities have turned to a new system called Track, made by a company called Veritone. It doesn't analyze faces, but looks to the rest of the body for clues — things like clothing, body type or hair — according to recent reporting by James O'Donnell for MIT Technology Review.