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PSU Researchers Publish Definitive Study on the Impact of Measure 110 Decriminalization

August 11, 2025
in Policy
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Portland State University researchers have recently unveiled the comprehensive results of a groundbreaking three-year study delving into the ramifications of Oregon’s evolving drug policies, primarily spotlighting Measure 110. This legislative initiative, initially celebrated for decriminalizing drug possession, faced a significant reversal with the enactment of House Bill 4002 in 2024, which reintroduced misdemeanor-level criminal penalties and established new frameworks aimed at connecting individuals to treatment services. The timing of this report is critical as it provides empirical insights into the multi-layered impacts of these policy shifts amid a complex social and public health landscape.

The extensive project was spearheaded by Associate Professors Kelsey Henderson and Christopher Campbell, alongside Professor Brian Renauer, under the auspices of the National Institute of Justice. Their investigation meticulously examined data spanning law enforcement activities, prosecution trends, sentencing alterations, and overall public safety metrics. Additionally, qualitative input from key decision-makers enriched the dataset, enabling a nuanced understanding of how policy changes reverberated through urban and rural jurisdictions differently, and how these shifts distorted or clarified previously observed trends.

Early phases of the project produced pivotal reports in 2023 and 2024. The first report investigated arrest patterns, police searches, and seizures, as well as law enforcement attitudes towards the criminalization of drug possession. The subsequent report analyzed the role of the criminal justice system in facilitating access to treatment, correlating criminal justice engagements like arrests and drug court referrals with treatment availability. However, the final installment transcends these earlier focuses, encompassing a broader evaluation of how the intertwined reforms—including the 2013 Justice Reinvestment Act and the 2017 “defelonization” statute—have collectively influenced public health and safety outcomes.

A key revelation from the study challenges dominant public discourse that often directly associates Measure 110 with increases in crime and overdose fatalities. The researchers found scant evidence supporting this causal link. Instead, their analytic model implicated external variables, chiefly the COVID-19 pandemic and the surge of fentanyl infiltration in drug markets, as the primary agents driving drug-related morbidity and mortality spikes. This nuanced distinction confronts oversimplified narratives and underscores the need to consider macro-environmental forces when evaluating policy efficacy.

Further dissecting the timeline, the data indicates that many drug-related indicators, such as arrest rates and prosecutorial charges, were stabilizing or declining even before Measure 110’s implementation. Drug overdose deaths began escalating well in advance of the decriminalization policy, peaking in 2023, a trajectory aligning more closely with the societal disruptions wrought by the pandemic and the potency of fentanyl-laced substances. These findings highlight how intersecting public health crises can confound interpretations of legal reforms.

The concept of “defelonization,” introduced in 2017, which reduced felony charges for possession of Schedule 1 or 2 substances to misdemeanors, demonstrated significant influence on judicial processing trends. Concomitant with defelonization was a marked decline in felony possession charges, balanced by an uptick in misdemeanor filings. Yet the pandemic and Measure 110 combined to effect a sharp decline in both categories by 2024, with misdemeanor charges falling dramatically from their 2019 peaks. This shift reflects the profound ways in which policy, public health, and societal behavior interpenetrate.

Paradoxically, conviction rates for drug possession charges surged post-Measure 110, climbing from 35% to nearly 65%. This counterintuitive development may be attributable to prosecutorial focus on larger quantity offenses, as lower-level cases diminished due to decriminalization or pandemic-related disruptions. Meanwhile, drug court enrollment figures remained relatively stable, mitigating early concerns that treatment engagement would falter amidst systemic transitions.

Researchers emphasize that defelonization was one of the most conspicuous and enduring reforms reshaping Oregon’s approach to low-level drug offenses. By decreasing the severity of charges, the legal system ostensibly reduced penalties; however, overall system involvement did not diminish significantly. Justice officials expressed broad support for defelonization, viewing it as a pragmatic compromise balancing public safety and rehabilitative aims.

Fundamentally, the study underscores that drug policy reforms alone are insufficient to transform public health and safety outcomes without the robust integration of accessible behavioral health services, economic stability, and social support networks. Simplistic cause-and-effect explanations fail to capture the complex interplay of socio-economic factors, public health crises, and institutional practices that collectively shape community wellbeing.

The advent of House Bill 4002 and the state’s renewed commitment to criminalizing drug possession pivot the focus towards expanding deflection—methods prioritizing treatment referrals over punitive measures. However, the researchers caution that the success of such strategies hinges not only on legislation but on the operational buy-in of the agencies involved and the availability of adequately funded, well-coordinated treatment pathways. Otherwise, policy reforms risk being symbolic gestures devoid of substantive impact.

In their concluding remarks, the researchers advocate for cautious optimism paired with pragmatic realism. Policy shifts must be accompanied by systemic capacity-building and inter-agency collaboration to realize the transformative potential of reform. Otherwise, efforts risk being undermined by institutional inertia and competing interests that dilute implementation fidelity.

This research contributes a vital, empirically grounded perspective amid fervent public debate surrounding drug policy. It compels stakeholders to reconsider simplistic narratives linking decriminalization directly to increased drug-related harm. Instead, it invites a holistic appreciation of intersecting factors—including public health emergencies and illicit drug market dynamics—that critically inform the lived realities behind the data.

As Oregon enters another pivotal phase of drug policy reform, these findings serve as both a caution and a guidepost, illustrating the complexity inherent in balancing criminal justice and public health objectives. Moving forward, maintaining an evidence-based, multidisciplinary approach will be essential to fostering sustainable progress in managing substance use disorders and enhancing community safety.

Subject of Research: Effects of Oregon drug policy reforms on law enforcement, prosecution, sentencing, and public health outcomes.
Article Title: (Not provided in the source text)
News Publication Date: (Not explicitly stated, inferred 2024)
Web References: https://archives.pdx.edu/ds/psu/43030, https://www.pdx.edu/news/portland-state-researchers-delve-impact-oregons-historic-drug-decriminalization-effort, https://www.pdx.edu/news/drug-possession-re-criminalization-looming-psu-researchers-study-impacts-measure-110
References: Portland State University final report and prior year studies on Oregon drug policy reform
Image Credits: Not provided
Keywords: Drug policy reform, Measure 110, decriminalization, defelonization, Oregon, criminal justice, public health, COVID-19 pandemic, fentanyl, drug-related deaths, law enforcement trends, treatment referral systems

Tags: criminal justice reform in Oregondecriminalization of drug possessiondrug policy and public healthdrug treatment services frameworkempirical insights on drug legislationHouse Bill 4002 implicationslaw enforcement activities analysisOregon Measure 110 impact studyPSU drug policy researchpublic safety metrics evaluationqualitative research in drug policyurban versus rural policy effects
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