If the staffing is inadequate (which by official records seems to be the case here) a 30 minute window is plenty of time to damage one’s self (although now it seems he had a 3 hour window with sleeping guards). If the surveillance infrastructure is such that even a single guard had access to live-streaming video of every person on suicide watch, they can prevent it from happening.
That said, it boggles my mind why this guy was even taken off of suicide watch (insert conspiracy theory here).
