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A 1956 survey of the parole rules in each of the states revealed that in general the rules had changed little in one hundred years. Further comparison showed that no single rule was common to all of the states, that some parole documents contained as many as twenty to thirty rules, that some of the rules were unenforce able, that some were parts of statutes or were policy matters, and that there seemed to be a tendency to increase the number and rigidity of the rules in direct proportion to the inferior quality of the parole system.
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Nat R. Arluke (1969) studied this question.
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