Ignoring cost and installing as an issue which in public health it is. Mental Health gets terrible funding even going by public health standards.
How long does a dead body stay warm before you notice that there is an issue. Is the camera good enough that you can watch respiration’s or does it need a microphone. A heat sensor doesn’t distinguish the type of bodily fluid.
I’m just saying it is unlikely for a camera on a person in an acute state to even be useful. It can easily get blocked or covered. If the level of monitoring is that high a camera may just add to fear and suspicion. Or even the idea that they are forgotten.