"No DAT [Drug and Alcohol Testing] deterrent effects were evident for past month use during any of four follow-up periods. Prior-year drug use was reduced in two of four follow-up self-reports, and a combination of drug and alcohol use was reduced at two assessments as well. Overall, drug testing was accompanied by an increase in some risk factors for future substance use. More research is needed before DAT is considered an effective deterrent for school-based athletes."
Goldberg L, Elliot DL, MacKinnon DP, et al. Outcomes of a prospective trial of student-athlete drug testing: the Student Athlete Testing Using Random Notification (SATURN) study" [published correction appears in J Adolesc Health. 2008 Jan;42(1):107]. J Adolesc Health. 2007;41(5):421-429. doi:10.1016/j.jadohealth.2007.08.001