Chicago)合撰的一份報告指出,美國監獄內三分之二囚犯被強迫勞動,非工業工作的平均最低時薪僅為13美分(約1.02港元),平均最高時薪是52美分(約4.08港元)。 Glaze, Lauren E.; Bonczar, Thomas P. Probation and Parole in the United States
Schneeberger and Pieri, 1991, cited by McGovern et al., 2001. Shockey, K.M.; Glaze, L.S.; Baloga, S.M. (2004). Analysis of Alba Patera Flows: A Comparison