THE JUSTICE DEPARTMENT'S announcement on Thursday that it would seek to end the use of private contractors to run its federal prisons was a monumental one that quickly sent private prison stocks plunging and drew praise from dozens of human and civil rights groups that for years had been denouncing abuse and neglect in private facilities.

In a memo explaining the decision, Deputy Attorney General Sally Yates wrote that private prisons "simply do not provide the same level of correctional services, programs, and resources," "do not save substantially on costs," and "do not maintain the same level of safety and security" as facilities operated by the Bureau of Prisons.

But as the criminal justice community began to take stock of the news, many also expressed hopes that the DOJ would not be the only government agency to cut ties with the private companies, which also operate state prisons and immigration detention centers.