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2. Cannabis drug testing - Wikipedia

   en.wikipedia.org/wiki/Cannabis_drug_testing

   Cannabis use is detectable with hair tests and is generally included in the standard hair test. Hair tests generally take the most recent 1.5 inches of growth and use those for testing. That provides a detection period of approximately 90 days. [5] If an individual's hair is shorter than 1.5 inches, this detection period will be shorter.

3. Hair analysis - Wikipedia

   en.wikipedia.org/wiki/Hair_analysis

   Chemical hair analysis may be considered for retrospective purposes when blood and urine are no longer expected to contain a particular contaminant, typically three months or less. Its most widely accepted use is in the fields of forensic toxicology, in pre-employment drug testing and, increasingly, in environmental toxicology.

4. Forensic toxicology - Wikipedia

   en.wikipedia.org/wiki/Forensic_toxicology

   Chemicals in the bloodstream may be transferred to the growing hair and stored in the follicle, providing a rough timeline of drug intake events. Head hair grows at rate of approximately 1 to 1.5 cm a month, and so cross sections from different sections of the follicle can give estimates as to when a substance was ingested.

5. How Common Is Teenage Hair Loss? - AOL

   www.aol.com/common-teenage-hair-loss-125700178.html

   But after puberty, the hormone may mess with your hair follicles, causing them to shrink (known as miniaturization). ... A 2020 meta-analysis of 21 trials testing metformin found the drug had a ...

6. Drug test - Wikipedia

   en.wikipedia.org/wiki/Drug_test

   Hair drug testing is a method that can detect drug use over a much longer period of time than saliva, sweat or urine tests. Hair testing is also more robust with respect to tempering. Thus, hair sampling is preferred by the US military [66] and by many large corporations, which are subject to Drug-Free Workplace Act of 1988.

7. Hair follicle - Wikipedia

   en.wikipedia.org/wiki/Hair_follicle

   There are many structures that make up the hair follicle. Anatomically, the triad of hair follicle, sebaceous gland and arrector pili muscle make up the pilosebaceous unit. [1] A hair follicle consists of : The papilla is a large structure at the base of the hair follicle. [4] The papilla is made up mainly of connective tissue and a capillary ...