I'm after information about hair testing for drugs?

This site --> http://www.craigmedical.com/Hair_Drug-Test_FAQ.htm will answer your questions and more...

Q: Have scientific studies been conducted and published in peer reviewed literature which clearly demonstrate the effectiveness of the PDT-90 testing lab’s hair analysis method?

Q: How long does it take to get the test results?

Q: Does the lab's method distinguish between drug ingestion and external contamination? External contamination could cause false positive results?

Q: Does the lab identify THC-COOH (carboxyl THC) in reporting out positive marijuana results?

Q: Does the PDT-90 lab digest or liquefy the hair to completely release all of the drugs?

Q: Does the lab cut the hair into tiny pieces prior to washing the sample?

Q: Is the lab able to distinguish between d and L methamphetamine?

Q: Has the PDT-90 lab maintained or participated in an independent Quality Control or Proficiency Testing Program for hair analysis? What were the results?

Q: How much experience does the PDT-90 lab have with hair analysis?

Q: Has the lab received FDA clearance on its hair testing assays?

Q: What is RIAH (Radioimmunoassay of hair)?

Q: What drugs are included in a standard test?

Q: How sensitive is hair testing in detecting drug users?

Q: What time period does a standard test cover?

Q: How soon after use can a drug be detected in hair?

Q: What is the shortest time period that can be accurately evaluated?

Q: How much hair is needed for the test?

Q: Can hair be taken from a hairbrush?

Q: Can tests be run on people with little or no hair?

Q: Is there a risk that the results of a hair test can be affected by environmental contamination?

Q: Does hair color or texture affect the results of the test?

Q: Does chemical treatment of the hair affect the test results?

Q: Does the lab perform GC/MS, GC/MS/MS or LC/MS/MS confirmation of all positive results?

Q: Has hair testing been admitted in court?

Q: Is the PDT-90 lab regulated by the Food and Drug Administration (FDA)?

Q: Is hair testing included in SAMHSA/NIDA guidelines?

They test the hair follicle so yes it works. However, I am not sure what drugs they can and can not detect but I do know for certain they can tell if you smoke cigarettes. So I beleive it is more likely dependent on what they test for.

Wow, the guy above me just asked you alot of questions and gave you zero answers. They cut a small section underneath the top layer of your hair. The test will go back as far as the hair is long.

They remove the hair all the way from the root (folicle) and they can isolate anything that you have put into your body since that hair began to grow inside the head. (I keep mine shaved bald )lol.

Please see the Google search for more details on Hair testing for drugs.