“…Among people who inject drugs (PWID), overdose (usually related to heroin) is the leading cause of death (Sporer, 1999; Tyndall et al, 2001), even surpassing HIV-related morbidity (Tyndall et al, 2001). Community studies in the US and elsewhere estimate that between one quarter to over half of PWIDs have ever experienced a drug overdose (Bradvik, Hulenvik, Frank, Medvedeo, & Berglund, 2007; Latkin, Hua, & Tobin, 2004; Philbin et al, 2008; Pollini, McCall, Mehta, Vlahov, & Strathdee, 2006; Seal et al, 2001; Sergeev, Karpets, Sarang, & Tikhonov, 2003; Sherman, Cheng, & Kral, 2007). …”