The inmate classification system is crucial principle for modern prison administration as well as the key subjects of research on penology.

罪犯分类制度是近代监狱管理的重要原则，也是监狱理论的核心研究课题。

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He stressed that it was accepted that slopping out had to be replaced in a modern prison system but the prison service was seeking to resolve the issue.

BBC: Prisoner wins slopping out move