The inspector general blamed "lack of communication" among guards for the treatment, but also said the Bureau of Prisons lacks written rules.
Biden administration apologizes for sticking inmate in a cage for 21 hours
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Online records maintained by the Federal Bureau of Prisons said Mack, 40, was released Monday from a federal prison in Dublin, California, near San Francisco.
Allison Mack, actress convicted in NXIVM sex-trafficking case, is released from prison
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