Private prison proponents say their facilities are efficiently run and can save governments money. However, studies show that private prisons are not necessarily more cost-effective and may even be more expensive. Some critics say cost savings come at the expense of security, rehabilitation efforts, and quality-of-life issues. State-funded studies show that private prisons keep only lower-cost inmates, aiding their bottom line. Organizations and denominations, including the Presbyterian Church (U.S.A.), the United Methodist Church, and the Catholic bishops of the South have called for a moratorium on construction of private prisons.