Triangulated investigating: An approach to the estimating of the extent of heroin use

An increased national concern in recent years about the problem of abuse of various drugs led to a number of efforts at estimating their prevalence. In part, these studies are remarkable for their widely divergent findings. One source of difficulty is a tendency to rely on single measurements. Social scientists have suggested that the use of multiple measures - triangulation - reduces the risk of measurement error. Using data from an epidemiological investigation of the prevalence of drug use in a southwest Michigan county, several methods of estimating heroin use were examined and compared: informants from law enforcement and community service agencies, arrest records, treatment data, and a formula based on the economics of heroin and the dollar value of acquisitive crime, and interpolation of calculations from national trends. The range of estimates, based on these different procedures, varied from 250 to 3,500 addicts. Triangulation techniques indicated lower estimates of drug addiction. Suggestions for further use of these techniques are made.