Random drug testing in US public school districts.
Ringwalt C, Vincus AA, Ennett ST, Hanley S, Bowling JM, Yacoubian GS Jr, Rohrbach LA.
Ringwalt C, et al.
Am J Public Health. 2008 May;98(5):826-8. doi: 10.2105/AJPH.2007.123430. Epub 2008 Apr 1.
Am J Public Health. 2008.
PMID: 18381986
Free PMC article.
Clinical Trial.