Prisoners can get plastic razors with the blades embedded in the plastic heads. In more secure prisons they are allowed only to take them into the shower to use them, and are expected to return them after the shower. If they do not or they are tampered with then the guards lock the place down and start searching.
Even more secure places like mental wards will have a group of people shave all at once under direct supervision. The person watching will take the razors back after they are used.
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