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. Author manuscript; available in PMC: 2020 Nov 1.
Published in final edited form as: Forensic Sci Int. 2019 Sep 13;304:109939. doi: 10.1016/j.forsciint.2019.109939

Table 3.

Results of agreement between the inner packaging and the extract for the 191 exhibits analyzed.

Inner Packaging Extract Percent Occurrence Result Type
Drug Detected Same Drug Detected 79% (n = 151) True Positive
Drug Detected No Drug Detected 1.5% (n = 3) False Positive
Drug Detected Different Drug Detected 2.5% (n = 5) False Positive
No Drug Detected Drug Detected 4% (n = 7) False Negative
No Drug Detected No Drug Detected 13% (n = 25) True Negative
Overall Accuracy: 92%