| What it is | This arm combines Motivational Interviewing sessions with a Community Reinforcement Approach (CRA) and provides all standard drop-in center services. | Participants receive Strengths-Based Outreach and Advocacy (SBOA) tailored to their needs, in addition to all standard services. | Both MI/CRA and SBOA behavioral interventions are provided together, along with standard services from the center. | Participants only receive the standard services normally available to youth at the drop-in center. |
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| Role in trial | Evaluates whether adding MI/CRA to standard services can prevent opioid use disorder in homeless youth. | Tests if SBOA added to standard services improves outcomes related to opioid use disorder or associated risks. | Determines if a combined behavioral approach (MI/CRA + SBOA) further reduces opioid use risk when delivered with usual services. | Serves as the active comparator arm, reflecting the standard service experience. |
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| Primary use | To strengthen motivation for change and build life skills that may reduce opioid use and related risks. | To help youth identify their strengths, set goals, and connect to community resources as a way to buffer substance use and associated challenges. | To assess whether blending MI/CRA and SBOA more effectively prevents opioid use disorder or related risks than either approach alone. | To deliver the standard range of services and supports for homeless youth as typically available at the drop-in center. |
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| How it is given or performed | Participants attend two Motivational Interviewing sessions and twelve 1-hour Community Reinforcement Approach sessions, with all standard center services accessible. | SBOA session count and frequency are tailored to each participant's needs; participants also access all standard services. | Participants receive both structured MI/CRA sessions and individually tailored SBOA sessions, in addition to standard drop-in services. | Participants access the regular drop-in center’s services, such as basic needs assistance, counseling, and health supports. |
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| Evidence status | The MI/CRA approach has been tested in other substance use and adolescent samples but its effectiveness for preventing opioid use disorder in homeless youth is still being evaluated. | SBOA is supported by some published research for improving engagement and reducing risk among homeless youth, but data specific to opioid use prevention are limited. | The efficacy of combining MI/CRA and SBOA for reducing opioid use or related outcomes in this population is experimental and not yet established. | Standard services as usual have not been proven sufficient for preventing opioid use disorder in homeless youth, which is why enhanced interventions are being tested. |
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| Important limitations | Success depends on participant engagement in structured sessions and access to stable contact points for session delivery, which can be challenging for youth experiencing homelessness. | Flexible SBOA delivery method may lead to varying levels of exposure, and unstable circumstances may limit capacity to participate fully. | Coordinating both interventions for individuals facing housing instability may be especially difficult, risking incomplete delivery. | Usual services may lack targeted behavioral strategies for substance use prevention, and many youth remain at risk despite access to standard supports. |
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