Interesting. I used to work psych intensive care but we didn't have rules like that because our nurse's station was completely enclosed and locked except for a small window near the ceiling over 5 feet up (I had to get on my toes to pass anything through to a patient).

(also worth noting that because of this, and being on the 3rd floor, the nurse's station was hot as a camel's balls in the summer. Regularly 92 degrees while the patients were freezing. So glad I don't work there anymore lol)