“…Lead is incorporated into human hair and hair roots (Bos et al 1985;) and has been explored as a possibly noninvasive approach for estimating lead body burden (Gerhardsson et al 1995b;Wilhelm et al 1989). The method is subject to error from contamination of the surface with environmental lead and contaminants in artificial hair treatments (i.e., dyeing, bleaching, permanents) and is a relatively poor predictor of PbB, particularly at low concentrations (<12 μg/dL) (Campbell and Toribara 2001;Drasch et al 1997;Esteban et al 1999). Nevertheless, levels of lead in hair were positively correlated with children's classroom attention deficit behavior in a study (Tuthill 1996).…”