“Confusion over biometric privacy laws in the U.S. is leading to different outcomes for tech giants embroiled in legal disputes over facial scanning. An Illinois court recently ruled that Google did not flout local laws by using facial-scanning to help people organize photo galleries through its Photos service. Facebook, on the other hand, is appealing a ruling that its face-identifying “tag” tool violated similar laws. Here, Fortune analyzes the differences between the two cases…”