FostrSpace-CASA R61/R33

The goal of this clinical trial is to identify gaps in substance use prevention across existing CASA trainings and the FostrSpace app for foster youth and test how substance use trainings for CASA volunteers could help facilitate FostrSace app referrals to reduce and prevent substance use among CASA youth.

Inclusion Criteria: * Adolescents and young adults will be eligible if they are age 13-20, are proficient in English, have an assigned CASA worker, and have a device with web access. * CASAs (ages 18 and over) will be eligible if they are assigned to a youth between the ages of 13- 20. Exclusion Criteria: * Youth: Exclusion criteria include being non-English speaking, being within 3 months of ending with CASA services, cognitive impairment that precludes ability to provide informed consent. * CASA: Exclusion criteria include being non-English speaking and working with a youth who is within 3 months of ending with CASA services.