Stainless steel lavatories and commodes are also used. This prevents vandalism or the making of weapons. There are a number of prison and prison cell configurations, from simple police-station holding cells to massive cell blocks in larger correctional facilities. The practice of assigning only one inmate to each cell in a prison is called single-celling or "single-bunking" (as in "bunk bed"). The practice of putting two persons to a cell is referred to as "double-bunking." In many countries, the cells are dirty and have very few facilities. Other countries may house many offenders in prisons, making the cells crowded. Prison cells in the UK In the United Kingdom, cells in a police station are the responsibility of the custody sergeant, who also logs each detainee and allocates him or her an available cell. Custody sergeants also ensure cells are clean and as germ-free as possible, in accordance with the Human Rights Act of 1998. Prison cells in the US In the United States, the standard cell is equipped with either a ledge or a steel bedstead that holds a mattress. A one-piece sink/toilet constructed of welded, putatively stainless steel is also provided. Bars typify older jails, while newer ones have doors that typically feature a small safety glass window and, often, a metal flap that can be opened to serve meals. A limited number of United States prisons offer upgrades. Costing around $100 a night, these cells are considered cleaner and quieter, and some of them offer extra facilities. High-security cells Often, different standards for cells exist in a single country and even in a single jail. Some of those cells are reserved for "isolation", where a convict is kept alone in a cell as punishment method. Some isolation cells contain no furnishing and no services at all. References External links Celebrity Justice: Prison Lifestyles of the Rich and Famous, Matt Clarke (Article on pay-to-stay prison facilities) 91111 Now Penology Penal imprisonment Law enforcement Rooms