1. Society of Hair Testing Website: http://www.soht.org.
2. Statement of the society of hair testing concerning the examination of drugs in human hair;Society of Hair Testing;Forensic Sci. Int.,1997
3. Society of Hair Testing, Consensus of the society of hair testing on hair testing for doping agents, http://www.SOHT.org/html/Statements.html.
4. Recommendations for hair testing in forensic cases;Society of Hair Testing;Forensic Sci. Int.,2004
5. Consensus of the Society of Hair Testing on hair testing for chronic excessive alcohol consumption;Kintz;Forensic Sci. Int.,2010