response to the emerging opiate use, opiate substitution treatment (OST) first appeared in the EU in the late 1960s (EMCDDA, 2000). Several international studies show that OST treatment is effective in reducing crime (Schwarts et al., 2009), reducing risks (Keen, Oliver, Rowse, & Mathers, 2003), reducing morbidity and mortality (Moller, Karymbaeva, Subata, Kiaer, 2009) reducing heroin use (Amato, Davolia, Peruccia, Ferria, Faggiano, & Mattick, 2005), reducing the use of other illegal drugs (Masson et al., 2004), increasing treatment retention (Amato et al., 2005) and increasing quality of life regarding employment, housing status and education (Vanagas, Padaiga, & Bagdonas, 2010).