Deposition of cannabinoids in hair after long-term use of cannabis
Deposition of cannabinoids in hair after long-term use of cannabis.

Cannabinoid concentrations in hair from documented cannabis users.
Cannabinoid concentrations in hair from documented cannabis users.

Differentiation between drug use and environmental contamination when testing for drugs in hair
http://marijuana.researchtoday.net/a.../4/11/1485.htm

Evaluation of the IDS One-Stepā?¢ ELISA kits for the detection of illicit drugs in hair
ScienceDirect - Forensic Science International : Evaluation of the IDS One-Step™ ELISA kits for the detection of illicit drugs in hair


Hope there's something in there that helps!

-Granny:hippy: