Hospital grade outlets cannot overcome the tenacity of human folly. In South Africa, a hospital noted that patients in a particular bed in the ICU unit were found dead on Saturday morning on a regular basis. Suspecting a serial killer, investigators set up a surveillance camera. What it caught was a cleaning person coming in on Friday night. That person would unplug the respirator for that killer bed, plug in the vacuum cleaner, clean the room, then plug the respirator back in when he/she was done.
