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Study excerpt: "Participants were 559 substance users recruited from multiple sources (parks, streets, prisons, methadone maintenance therapy, and...
Study excerpt: "Participants were 559 substance users recruited from multiple sources (parks, streets, prisons, methadone maintenance therapy, and drop in centers) . . . a non- probability sampling technique that is appropriate to use in research when the members of a population are difficult to locate. In this research, we collected data from substance abusers . . . and then asked those individuals to locate other substance abusers whom they knew." Barati, M., Ahmadpanah, M., & Soltanian, A. R. (2014). Prevalence and factors associated with methamphetamine use among adult substance abusers. Journal of Research in Health Sciences, 14(3), 221-226. Excerpt from page 222. This sampling method is called:
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