Federal prison takes down kennel-like exercise pens for inmates in solitary confinement - The Globe and Mail
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Fenced yard at American maximum security prison. Here inmates are allowed outside to walk, exercise, and socialize Stock Photo - Alamy
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Secret practice that allows the transfer of prisoners doesn't always protect them – Center for Public Integrity
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160+ Maximum Security Prison Stock Photos, Pictures & Royalty-Free Images - iStock | Jail, Steel door, Prison exterior
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