well documented article: http://www.childrensnational.org/files/PDF/MACCHE/HairAnalysis-HCP.pdf
Jay Reynolds Senior Member. Dec 14, 2012 #1 well documented article: http://www.childrensnational.org/files/PDF/MACCHE/HairAnalysis-HCP.pdf
Mick West Administrator Staff member Dec 14, 2012 #2 Linked to that: http://www.atsdr.cdc.gov/hac/hair_analysis/appendix_c_sharon.html