Although the potential for prisons to act as the setting for HIV trans
mission has been recognised, there is an enduring lack of knowledge in
this area. Data are presented on patterns of injecting and sharing in
Edinburgh prison (Scotland), 1993-1994. There was a relatively low le
vel of injecting in Edinburgh prison during this period, with 13% (8/6
0) of a sample of drug users having injected at some point during thei
r current sentence. The majority (6/8) of those who had injected had s
hared injecting equipment. Where sharing took place, the level of HIV
risk was variable, but would have been higher had cleaning fluids not
been available within the prison, or had they not been used by sharers
. The implications of this study for drug service provision in prisons
is discussed.