1. Caplan Y, Goldberger B. Alternate specimens for workplace drug testing. J Anal Toxicol 2001; 25:396–399.
2. Cone E. Alternate samples: oral fluid (saliva), sweat, hair, and meconium. The Clinical Toxicology Laboratory, Contemporary Practice of Poisoning Evaluation. Washington, DC: AACC Press, 2001.
3. Kintz P. Drug Testing in Hair. Boca Raton, FL: CRC Press, 1996.
4. Strano-Rossi S, Bermejo-Barrera A, Chiarotti M. Segmental hair analysis for cocaine and heroin abuse determination. Forensic Sci Int 1995; 70:211–216.
5. Rollins DE, Wilkins DG, Kreuger GG, Augsburger MP, Mizuno A, O’Neal C, et al. The effect of hair color on the incorporation of codeine into human hair. J Anal Toxicol 2003; 27:545–551.