So I want to ask what happens if you have a photo that is falsely identified as one in question and then an automated mechanism flags you and reports you to the FBI without you even knowing. Can they access your phone at that point to investigate? Would they come to your office and ask about it? Would that be enough evidence to request a wiretap or warrant? Would they alert your neighbors? How do you clear your name after that happens?

edits: yes, the hash database is downloaded to the phone and matches are checked on your phone.

Another point is that these photos used to generate the fingerprints are really legal black holes that the public is not allowed to inspect I assume. No one wants to be involved in looking at them, no one wants to be known as someone who looks at them. It could even be legally dangerous requesting to find out what has been put into the image database I assume.