1. Available at: http://www.emcdda.europa.eu/publications/2015/new-psychoactive-substances . Accessed July 2015.
2. Available at: http://www.emcdda.europa.eu/publications/joint-report/MDPV . Accessed July 2015.
3. Mali N, Karpe M, Kadam V. A review on biological matrices and analytica methods used for determination of drug of abuse. J Appl Pharm Sci. 2011;1:58–65.
4. Jenkins AJ. Drug testing in alternate biological specimens. Totowa: Humana Press; 2008.
5. Mandatory Guidelines for Federal Workplace Drug Testing Programs. SAMHSA, Notice of Proposed Revisions, 69 FR 19673–19732, Washington, 2004. Available at: http://www.gpo.gov/fdsys/granule/FR-2004-04-13/04-7984/content-detail.html . Accessed July 2015.