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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 9.

Percentages of Respondents with Positive Assays Reporting Drug Use and Nonuse

Negative Test
Result		 Positive Test
Result
Cocaine Used <1% 33%
Not Used 99% 67%
THC Used 8% 68%
Not Used 92% 32%
Amphetamine Used <1% 52%
Not used 99% 45%