Abstract:
Background:The global spread of illicitly manufactured fentanyl represents a critical intersection between neuroscience, law, and public health. Originally developed as a potent analgesic in the 20th century, fentanyl’s low production cost, chemical adaptability, and high lethality have enabled its rapid proliferation through transnational criminal networks. While North America remains the epicenter of the crisis, with synthetic opioids accounting for the majority of overdose deaths, recent evidence indicates the gradual expansion of fentanyl and its analogues into Europe, where emerging threats include nitazenes and xylazine-adulterated compounds.
Methods:This study adopts a multidisciplinary approach that combines neuroscientific, criminological, and legal perspectives to analyze the causes and consequences of fentanyl use and distribution. Through a systematic review of biomedical and legal literature, the study outlines the neurobiological mechanisms underlying opioid dependence, particularly the role of
craving and impaired reward circuitry involving the mesolimbic dopaminergic system.
Results: Thesefindings reveal structural and functional changes in the brain that significantly affect volitional control, thereby challenging the traditional legal assumption that free will is a prerequisite for culpability.
Epidemiological data from 2019 to 2025 show a steady increase in fentanyl-related deaths, particularly among adolescents and first-time users exposed to adulterated substances.
Conclusions:Although harm-reduction strategies, such as naloxone distribution, fentanyl test strips, and medication-assisted treatment, have yielded measurable benefits, they remain insufficient to counter the evolving complexity of synthetic opioid markets. Overall, the findings underscore the urgent need to align legal and criminal policy frameworks with neuroscientific evidence, promoting a balanced approach that integrates public health, justice, and human rights in addressing the global fentanyl crisis.