Publications
Selected research outputs.
Peer-reviewed work by Tyler Marshall, PhD, MPH, spanning substance use, mental health, shared decision-making, digital health, and overdose response.
Selected publications
Research connected to better decisions and care.
Titles, journals, dates, and identifiers are verified against Tyler Marshall’s ORCID record. DOI links lead to the publisher record.
Evidence-based interventions for youth with concurrent mental health and substance use disorders: A scoping review
A scoping review of evidence-based interventions and health-related services for youth who use nonmedical opioids in Canada and the United States
Patient-reported outcomes on sleep quality and circadian rhythm during treatment with intravenous ketamine for treatment-resistant depression
Beliefs, attitudes and experiences of virtual overdose monitoring services from the perspectives of people who use substances in Canada: A qualitative study
Electronic harm reduction interventions for drug overdose monitoring and prevention: A scoping review
Investigating uses of peer-operated Virtual Overdose Monitoring Services (VOMS) beyond overdose response: A qualitative study
Virtual overdose monitoring services: A novel adjunctive harm reduction approach for addressing the overdose crisis
Treatment options and shared decision-making in the treatment of opioid use disorder: A scoping review
The impact of shared decision-making on the treatment of anxiety and depressive disorders: Systematic review
Findings in practice
What this research helps us understand.
Selected findings are summarized in plain language to show how rigorous research can inform service design, evaluation, and implementation. These summaries reflect the scope and limitations of each study.
Young adults’ care decisions deserve direct attention.
In a cross-sectional study of emerging adults and healthcare-provider dyads in primary care and community addiction and mental-health settings, shared decision-making was examined alongside symptoms, quality of life, and the clinical context.
Why it matters: Evaluation should examine not only whether services are offered, but whether people meaningfully participate in decisions about their care.
Read the study →Safety, privacy, and trust shape digital harm-reduction use.
People who use substances described virtual overdose monitoring as a potentially safer alternative to using alone, while also identifying concerns about emergency-response reliability, privacy, stigma, and past experiences of trauma or criminalization.
Why it matters: Digital health services need to be evaluated for trust, confidentiality, accessibility, and real-world fit—not just technical performance.
Read the study →The evidence base is promising, but still fragmented.
A scoping review found a modest and heterogeneous body of intervention research for youth with concurrent mental-health and substance-use disorders. Depression, alcohol, and cannabis-related conditions were among the most commonly studied areas, but clearer guidance requires stronger and more consistent research.
Why it matters: Evidence synthesis can identify both what is known and where organizations should avoid overclaiming certainty.
Read the review →Promising technology still needs careful evaluation.
A scoping review mapped electronic interventions designed to support overdose monitoring and prevention. The field shows promise, but the available evidence remains insufficient to establish effectiveness across settings and populations.
Why it matters: Responsible innovation pairs product development with staged feasibility, safety, implementation, and outcome evaluation.
Read the review →Current research
JARA research program.
Phase 1A feasibility and co-design study of JARA
A multi-context study examining usability, acceptability, implementation considerations, and stakeholder priorities for an AI conversational agent supporting adults with substance-use concerns.
Status: Manuscript under journal review. Full citation and DOI will be added when publicly available.
Safety and conversation-flow validation
A staged research program examining response quality, appropriateness, recovery orientation, safety, accuracy, tone, and interaction patterns.
Status: Protocol development and ethics planning.