The study used information from records from six Minnesota Model drug treatment centers. The records were examined in 1991. Nearly all the participants were white males of middle socioeconomic status. The MMPI-2 profiles were analyzed using profile code types and a multiple analysis of variance. A chi-square test revealed that those who were classified as neurotic were more likely than others to fail treatment. In addition, a MANOVA indicated that elevated T-scores on Scales 7 and 8 were also related to noncompletion. A comparison of these results with similar studies indicated that attempting to construct a predictive model based on a single objective measure may be insufficient to determine treatment outcome. Tables, author photographs and biographies, and 22 references (Author abstract modified)