There's too many sharp metal parts on the robot. And the wiring could be used to hang oneself. Oh, and although it's relatively rare, we do get the occasional person with that paranoid delusion (realistic understanding of the world?) about technology taking over and displacing humans .... there are reasons that the televisions on our unit are enclosed in these big lexan boxes.
Besides, the robots probably cost more to purchase and maintain than most nuthouses pay the average psych tech.
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