“…The existing literature describes the efficacy of OEND programs among PWUO, those in treatment for opioid use disorder, and nonusers. PWUO are prioritized through naloxone distribution by harm reduction services such as syringe access programs (Clark et al, 2014;Giglio et al, 2015;Jones et al, 2017;Keane et al, 2018;Lankenau et al, 2013;Reed et al, 2019;Walley et al, 2013;Wheeler et al, 2015). Those in treatment for opioid use disorder are also willing to become trained to administer naloxone (Bagley et al, 2015;Bowman et al, 2014;Jones et al, 2017;Katzman et al, 2019;Kuehn, 2014;Lankenau et al, 2013;Tyler, 2018;Walley et al, 2013;Williams et al, 2013).…”