This article is about scientific uses of hair analysis. For pseudo-scientific health practice, see Hair analysis (alternative medicine).
Hair analysis
Schema depicting how human hair appears in a scanning electron microscope
HCPCS-L2
P2031
Hair analysis may refer to the chemical analysis of a hair sample, but can also refer to microscopic analysis or comparison. Chemical hair analysis may be considered for retrospective purposes when blood and urine are no longer expected to contain a particular contaminant, typically three months or less.
Its most widely accepted use is in the fields of forensic toxicology, in pre-employment drug testing and, increasingly, in environmental toxicology.[1][2] Several alternative medicine fields also use various hair analyses for environmental toxicology, but these uses are controversial, evolving, and not standardized.
Microscopic hair analysis has traditionally been used in forensics as well. Analysts examine a number of different characteristics of hairs under a microscope, usually comparing hair taken from a crime scene and hair taken from a suspect. It is still acknowledged as a useful technique for confirming that hairs do not match. But DNA testing of evidence has overturned many convictions that relied on hair analysis. Since 2012, the Department of Justice has conducted a study of cases in which hair analysis testimony was given by its agents, and found that a high proportion of testimony could not be supported by the state of science of hair analysis.[citation needed]
^Masters, Rogers D. "Validity of Head Hair Analysis and Methods of Assessing Multiple Chemical Sensitivity". Dartmouth College. Archived from the original on September 3, 2005. Retrieved December 9, 2006.
^Dartmouth Toxic Metals Research Program. A Metals Primer. Archived November 26, 2006, at the Wayback Machine Center for Environmental Health Sciences at Dartmouth. Accessed December 9, 2006.
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