“…Relatively few addicts, and dependent cocaine users in particular (Stark et al, 1990;Stark, 1992;Festinger, 2002), follow through on referral unless access to treatment is rapid and easy; in Vancouver, it was neither. In the absence of immediate access addicts may need to be supported and shepherded to the door (Bokos et al, 1992;Lidz et al, 1992;Donovan, 2001), a function the exchange was not resourced for and may not have seen as its role. Injectors who knew they were infected with HIV were half as likely to share syringes or needles (Wood et al, 2001a) but, despite making referrals, the exchange also led few injectors to seek an HIV test.…”