The purpose of this study is to identify which personal, familial, environmental, and social factors are associated with the utilization of child protection services, including parental support programs, by mothers who misuse illicit substances. Participants are 56 mothers with substance use and addiction-related problems, of whom 32 were receiving, voluntarily or otherwise, child protection services while 24 mothers had psychotropic drug use-related problems but were receiving no psychosocial services. Data were collected in the province of Quebec, Canada, between August 1998 and August 1999 . Results indicate that mothers who receive services are younger, have fewer interpersonal resources, live in lower socioeconomic conditions, and have greater family dysfunction (less parental supervision and more inconsistent discipline) than mothers who do not receive services from child protection agencies. However, there are no significant differences between groups with regards to maternal childhood trauma, psychological distress, antisocial behavior and the quality of the parent-child bond. The results of this study suggest that although both groups misuse drugs and have personal difficulties, some mothers will not need support from social services to take care of their children. Implications of these findings for prevention are discussed. The study's limitations are noted.