This study estimates the prevalence of drug injection at shooting gall
eries in Los Angeles and describes their characteristics. Data indicat
e that 23% of local drug injectors went to a gallery during the year b
efore their interview and that drug use at shooting galleries may have
been underestimated in other studies. ''Dirty works'' are commonly sh
ared in Los Angeles galleries, and gallery access is not limited to pe
ople who know each other. However, galleries in the eastern and wester
n United States appear to differ in their scale of operation, that is,
the number of users who visit them on a given day.