Prior research has identified a small group of adolescents who completely refrain from delinquent behavior. Researchers have hypothesized that these adolescents may be excluded from normative peer activities and are thus insulated from delinquent peer role models. A central argument in Moffitt's account of delinquency abstention, for example, is that delinquency abstainers are socially isolated due to certain unappealing physical/personality characteristics. Using the detailed friendship network data from the National Longitudinal Study of Adolescent Health (Add Health), the authors attempt to test Moffitt's account of delinquency abstention, particularly the association between social exclusion and delinquency. Their results do not suggest strong empirical support for the hypothesis that delinquency abstention is "correlated with unpopularity and social isolation." The complex associations between adolescent friendship network characteristics and delinquency abstention highlight the necessity for future research on peer contexts in which adolescents are embedded. The authors' findings appear to challenge Moffitt's theory, suggesting the need for certain modifications. (Contains 5 tables, 2 figures, and 4 notes.)