Adolescents who befriend drug using peers may be at risk for initiated and continued substance use. The present secondary data analysis examined how drug use homophily (i.e., similarity) in justice-involved boys’ friendship groups relates to their subsequent substance use variety across a period of five years. Participants were 1216 first-time adolescent offenders (M_{age Baseline} = 15.29; 100% male). Multilevel model analyses revealed that, among participants who entered the study with a history of substance use, drug use homophily was associated with greater subsequent substance use variety. Among participants who entered the study without a history of substance use, this association was no longer significant. The findings have implications for guiding justice system programming aimed at decreasing adolescent offenders’ substance use.

与吸毒同龄人交朋友的青少年可能面临开始和持续吸毒的风险。目前的二级数据分析检查了参与司法的男孩友谊团体中的药物使用同质性（即相似性）如何与他们随后在五年内的药物使用变化相关联。参与者是 1216 名初犯青少年（Mage _Baseline = 15.29; 100% 男性）。多层次模型分析显示，在有药物使用史的研究参与者中，药物使用同质性与随后的药物使用多样性有关。在没有药物使用史的研究参与者中，这种关联不再显着。这些发现对指导旨在减少青少年犯罪者物质使用的司法系统规划具有重要意义。