"Private prisons served an important role," Yates said in responding to the rapid rise in the inmate population. "But time has shown that they compare poorly to our own Bureau facilities." And she said with the number of inmates now dropping, there's less need for using outside contractors.
"This decline in the prison population means that we can better allocate our resources to ensure that inmates are in the safest facilities and receiving the best rehabilitative services - services that increase their chances of becoming contributing members of their communities when they return from prison," she wrote in a blog post explaining the decision
They found that private prisons don't save money, aren't efficient, aren't safe.