When left unchecked, prisoners without a cell can easily become criminally insane.
If 'room quality' is enabled and all your cells are high quality, some prisoners may not be assigned a cell because all the cells are too high in quality for them. Set up a holding cell and padded holding cell, even if you think you have enough cells and/or don't accept criminally insane (psych ward DLC) inmates. 9 Janitors/workmen/gardeners faffing about the storage room.5 No wandering around in the staffroom, get back to your cell Jimmy.