How Long Does A Hair Follicle Drug Test Go Back
According to a 2017 study urine tests have a detection window of up to 10 hours to about 1 week for most drugs except marijuana which can remain present in a person s urine for up to 30 days.
How long does a hair follicle drug test go back. It s a far better indicator of long term patterened drug use as opposed to only recent drug activity. How far back does a hair follicle test go to detect drug use. This means that the test can detect history of drug use in the last several years depending on the length of your hair and how fast your hair grows.
If a longer piece of hair is selected the drug test results can go back much further in fact years further to detect drug use. A standard hair follicle analysis covers a period of approximately 90 days 3 months but can vary depending on the growth rate of the hair. Depending on the length of the hair collected it can even go back as far as a year.
They know that their tests become increasingly unreliable over time. As hair grows slowly hair drug test do not usually detect use of any drug within the past week and not significantly affected by brief periods of abstinence from drugs. This is why drug test labs only claim to be able to go back 90 days.
They immediately discard the unused portion. However there s no limit to the length of the hair that s tested for drugs. Since human hair grows about a half an inch per month one and a half inches of hair is equal to a 90 day detection period.
A urine drug test is used to test for drug use over the three days preceding the test. It has a longer detecting window while urine drug testing can typically look back a week hair follicle drug tests have a detection window of 90 days. Furthermore a longer period can be covered if the test.
A hair follicle drug test is the only drug test that can detect repeated drug use up to 90 days prior to the. The remainder of the hair is discarded for testing purposes. The last 1 5 inches of your hair tell whether or not you ve consumed marijuana within the last 90 days.
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