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Public policy is rarely “self-executing”. Congress may legislate drug abuse control measures or the President may order the rescue of United States hostages held in Iran - but in the absence of effective implementation plans, it is unlikely that decisions of policy makers will be carried out with much success. Research into the outcomes of public policy designed to solve societal problems, such as drug abuse, is indeed necessary but not quite sufficient for understanding policy implications.
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Bleidt et al. (1985) studied this question.
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