https://archive.org/details/60-minutes-inside-cecot
Absolutely inhumane conditions. Constant torture, no access to clean water or medicine, solitary confinement, beatings… Only 3% of those we sent were convicted of a violent crime, the vast majority only had pending charges, probably for illegal immigration.
Higher quality video: https://archive.org/details/60minutes-cecotsegment


And some other places…
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