One of the problems that researchers frequently confront is the tracking and locating of research subjects. "Deviant" populations may present special difficulties in this regard. The experiences of a trained field survey unit doing drug-related research are examined. The tracking procedures which they developed are systematically presented. While the substantive focus is on doing research among drug abusers, many of the stated procedures are applicable to research on other deviant groups and, indeed, to all social groups.

In recent years the distribution of illicit narcotics in New York City has taken on a new character. Illicit drugs (mainly heroin) are being distinctively packaged prior to sale on the street. The labeling of street heroin entails stamping, writing, or pasting a name, symbol or number on the bag containing the drugs. Colored tape may also serve as the identifying marking. The authors discussed this phenomenon with drug users, drug dealers and police officials. A list of about 400 observed or reported heroin labels is presented. The authors examine why and how bag-marking is being done and its functions and dysfunctions within the illicit drug marketplace. They also describe the historical genesis of bag-marking. The report adds to our knowledge of the actual mechanics of street-level transactions involving illict drugs.

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