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CORRESPONDENCE operate a strict non-prescribing policy. A significant proportion of our notifications were provided by â€oe¿ non-statutory― sources such as voluntary agencies and drug users themselves. Although multisource enumeration methods are expensive and time consuming, they demonstrate the independence of different sources of information. The value of indi vidual sources for continued monitoring varies from place to place and from time to time, according to patterns of local servicedoi:10.1192/s0007125000220527 pmid:3167454 fatcat:xtw3otqktnghdjoqtbfpgcvxru