"Drug testing of athletes was not a significant predictor of marijuana use by male athletes in high school."
Source
Yamaguchi, Ryoko, Lloyd D. Johnston & Patrick M. O'Malley, "Relationship Between Student Illicit Drug Use and School Drug-Testing Policies," Journal of School Health, April 2003, Vol. 73, No. 4, p. 163.
http://www.monitoringthefutur…
