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Based on the data for 48 states in 1991 and the weighted least squares method, arrests related to illegal drugs show a positive relation with the percentage of one parent families, the degree of urbanization, per capita disposable income, other crimes, and the states which have a border or a coast or which permit gambling, and a negative relation with the police force, the educational level, and the unemployment rate.
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Yu Hsing (1996) studied this question.
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