Drug testing dating
A negative result indicates that you haven’t engaged in illicit drug use over the past 90 days. An inconclusive result isn’t common when testing procedures are followed.
Additional testing is required to confirm a positive result. All nonnegative tests undergo a second test, called gas chromatography/mass spectrometry (GC/MS). In some cases, improper collection of the hair specimen may result in the test being rejected completely. The laboratory responsible for testing will deliver the results to the individual or organization requesting the test.
Your results won’t be affected if you wash your hair, dye your hair, or use styling products.
The sample is then analyzed for signs of drug use during the 90 days preceding the test.
It’s typically used to test for: While a urine drug screen can detect if you’ve used drugs in the last few days, a hair follicle drug test can detect drug use in the past 90 days.
Your workplace may request a hair follicle test to screen for illicit drug use before hire or randomly during employment.
The collection and testing of hair for this test follows a very specific set of standards to increase accuracy.
During testing, the collected hair is washed and tested for environmental contamination that could change the results of the test.
This site displays a prototype of a “Web 2.0” version of the daily Federal Register.