I’m in HR and same here. Unfortunately with the US being such a litigious society the risk just isn’t worth it. Even a frivolous lawsuit costs time and money to defend against. I would personally hope it’s different for professions in institutions working with children or for the protection of society. However I could also see this being some sort of union issue where they’ve negotiated it not being able to disclose the info.
(Caveat here that I’ve never been HR for a union workforce so this is pure conjecture based on my understanding of the bargaining power of the union)