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Sutker and Allain (1973) suggest that nonincarcerated heroin addicts who are involved in the “street life style” would tend to obtain elevated scores on the Hs, D, Hy and Pd scales of the MMPI. If these findings were cross-validated, then personality descriptions of addicts would have to be modified accordingly. Also, improvement measured by decreases on the Hs and Hy scales soon after entering a drug-free environment may be a result of milieu differences rather than personality change. Four groups of heroin addicts, two hospitalized, urban drug abusers who were free of drug influence at testing (Hospitalized1 and Hospitalized2) were compared with two street addict samples, one from an urban (StreetNARA), the other a suburban (StreetSCNCC) environment. It was hypothesized that both the StreetNARA and StreetSCNCC groups would score significantly higher than the hospitalized groups and that there would be no differences between the hospitalized groups. As was expected, the street samples scored statistically higher on the Hs and Hy scales. However, data for the D and Pd scales failed to cross-validate the Sutker-Allain hypothesis. These data suggest that personality characteristics play a more dominant role in MMPI score elevations than the “street life style.” This contention was also supported by test-retest data on the Hospitalized2 sample measuring the effect of 90 days of hospitalization in a drug-free environment.

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