“…After 2013, the reported use of heroin in prison declined, while the use of buprenorphine, which is a common opioid substitution treatment (OST), increased. Other prisons around the world have found an increase in the misuse of OSTs, particularly buprenorphine, as well, likely due to them being less expensive than heroin; being more easily obtainable than heroin due to the possibility for the diversion of prescription OST medications and availability of formulations that can be more easily smuggled, such as sublingual films and tablets; often requiring smaller quantities; and the widespread belief among prisoners that buprenorphine is not able to be detected in urine drug screens (Bi‐Mohammed et al, 2017; Mjåland, 2014, 2016; Mohammed et al, 2016; Monico et al, 2021; Mravčík et al, 2018; Penfold et al, 2005; Plugge et al, 2009; Rousselet et al, 2019; Tamburello et al, 2017; Tompkins, 2016; Tompkins et al, 2009; White et al, 2016; Wright et al, 2014).…”