I had to recently look into the legal issues around the peephole situation. Though it is not what i would recommend, the legal definition of invasion of privacy does privide some guardrails. At least for California’s penal code there are definitions around intent to invade privacy for voyeurism and the reasonable expectation of privacy, which can be handled through consent. Again, we would recommend safer bathroom design and antibarricade access and staff nearby rather than peephole as a solution.