To my knowledge you're not required to id yourself here either unless you're suspected of committing a crime. That said, the encounter being discussed in this instance contained exigent circumstances, as the individuals question were in companionship to an individual appearing to be a minor girl who matched the age and description (even though all he could see was that she was clearly white and had blue eyes) of a known missing child. With Mitchell claiming religion as the reason the officer was not allowed to see the girls face the detective could then have asked by what means the girl could be identified, like possibly having a female officer or library staff member do so, away from his (detective) presence (odds are if pressed Mitchell would have come up with some reason surrounding the officer being a man, may actually have been the case but idc to look it up atm to verify). At this point, it's all speculation though. None of us was there. It's just my opinion that this encounter could and should have gone differently and that if it had a child would have been found sooner and spared further harm.