The National Institute on Drug Abuse has funded a marijuana "Potency Monitoring Project" at the school of Pharmacy at the University of Mississippi that has tracked important cannabinoid levels in confiscated marijuana since 1975. One indicator of generally accepted standards in any research field is the type of data deemed significant for researchers to study. In terms of analysis, this refers to the study of correspondence rules. Research analyzes indicators, variables x, y, and so on, and these indicators are assumed to correspond to the object of the scientist's study. The flaws in research designs can be found in an examination of whether the indicators really represent the phenomena being studied. This section asserts that scientists studying marijuana accept a correspondence rule which asserts that the constituent parts of marijuana, particularly D 9-THC, provide valid indicators for the marijuana itself. The Potency Monitoring Project provides an implicit example of this: it tracks and reports historical data for just four cannabinoids -- D9-THC, Cannabidiol (CBD), Cannabichromene (CBC), and Cannabinol (CBN).(1)