Scott,
I have never heard of a peephole in a toilet room door. I understand the balance of safety and patient privacy. In the past we specify ligature resistant fixtures to meet concerns about self-harm. There is language in the FGI Behavioral Health environment of care about allowing for visual & acoustical privacy. There are no specifics about how you achieve that privacy. Conversations include patient dignity.
I would think operational guidance would prohibit the use of a peep hole into a toilet room.
Thank you,