A hair strand drug test screens for illicit drug use and the misuse of prescription medication. Though commonly called a “hair follicle test ... of the hair specimen may result in the ...

In a Gwinnett County juvenile court, Good argued the hair-follicle testing by the two companies can result in false positives. She also alleged improper handling of the specimens and inadequate ...

Hair color is determined by melanocyte stem cells that multiply inside hair follicles, previous research has shown. These stem cells get signals to mature and make proteins that produce hair color.

The plan would allow federal executive branch agencies “to collect and test a hair specimen as part of their ... is at risk of failing the hair follicle test for a longer period.