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. Author manuscript; available in PMC: 2010 Jun 1.
Published in final edited form as: Eval Rev. 2009 Apr 7;33(3):211–225. doi: 10.1177/0193841X09333253

Table 6.

Cross-Tabulation of Results of Biological Assay and the Responses to the 48-Hour Drug Use Question for Marijuana Use

Negative Test
Result
Positive Test
Result
No 48-hour drug use 285 (.922) 012 (.316)
Yes 48-hour drug use 024 (.078) 026 (.684)
Total 314 (1.00) 046 (1.00)