New drones being sold in the USA are equipped with something called remote ID. In theory, it enables law enforcement to wirelessly identity the drone, who it’s registered with, and where the pilot is standing. This is very new though, and very few, if any, police departments have the tools needed to make use of it. It’s also possible to read remote ID from phones, but without the database, it only gives you so much info. Owners of older drones are supposed to attach a remote ID module to them in order to maintain legal flying, but someone being voyeuristic with their older drone probably isn’t following the rules.