“Determining how to provide effective mental health treatment for youth involved in the juvenile justice system - and ensuring that it continues after they exit detention - is one of the most complex challenges facing this system. This report examines how one jurisdiction, Bernalillo County, New Mexico, has taken extraordinary steps to address this challenge by ensuring Medicaid eligibility for detained youth and establishing a licensed, free-standing community mental health clinic adjacent to it detention facility. The report also provides an overview of how the county became an active site in Casey’s Juvenile Detention Alternatives Initiative and details how their new mental health clinic is being operated and financed, and the lessons emerging from their innovative approach.” Nine chapters make up this report: understanding the mental health challenge for juvenile detention reform; Bernalillo-becoming a model JDAI site; Bernalillo’s mental health challenge; organizing and building a mental health clinic; nuts and bolts of the clinic; assessing the clinic’s impact; key advantages of the onsite clinic; issues and challenges for Bernalillo County and lessons learned; and questions and implications for other jurisdictions.