45 To date, few studies have examined the effect of interagency collabora- tion on substance abuse assessment and treatment completion for par- ents who are involved in child wel- fare. Te purpose of this paper is to: (1) describe a statewide, interagency collaborative program aimed at pro- viding targeted substance abuse assessment and treatment to parents engaged in the child welfare system; (2) document the specialized assess- ment and treatment outcomes for parents engaged through this collab- orative program; and (3) determine factors related to successful treatment completion for parents involved in the child welfare system. Tis is a retrospective study of an open cohort of 13,829 individuals admitted to the Predictors of Substance Abuse Assessment and Treatment Completion for Parents Involved with Child Welfare: One State’s Experience in Matching across Systems Dorian E. Traube University of Southern California Amy S. He University of Southern California Limei Zhu Department of Human Services, Trenton, New Jersey Christine Scalise Department of Human Services, Trenton, New Jersey Tyrone Richardson Department of Children and Families, Trenton, New Jersey Acknowledgements: Tis study was supported by the Substance Abuse and Mental Health Services Administration’s National Center on Substance Abuse and Child Welfare. Te New Jersey Department of Children and Families, Division of Child Protection and Permanency, and Department of Human Services’ Division of Mental Health and Addiction Services would like to state that the opinions, fndings, and con- clusions or recommendations expressed in this article are those of the authors.