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What is the longest a hair follicle drug test detected?

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What is the longest a hair follicle drug test detected?

90 days
Hair drug tests have the longest detection period, and can typically detect drug use for up to 90 days. Depending on the drugs used, a hair sample can sometimes help determine when drug use occurred and whether it’s been discontinued.

Will peroxide remove drugs from hair?

Images revealed a loss of detectability of cocaine and its reaction products in hairs already after a short bleaching period. Since all compounds of interest are found in the hydrogen peroxide and wash solution, these findings indicate that all evidence of cocaine use might be lost after a hair bleaching treatment.

Can a hair follicle test go back 12 months?

When tested, each centimetre of hair therefore reflects one month’s history of drug use (or non-use). This is why hair strand testing is able to provide such a large window of detection, assessing drug use as far back as 6 months.

How long does drugs stay in hair follicle?

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.

Does bleaching your hair affect hair follicle test?

However, hair samples can be manipulated by cosmetic treatments, altering drug concentrations which eventually leads to false negative hair test results. In particular oxidative bleaching of hair samples under alkaline conditions significantly affects incorporated drug concentrations.

How long does it take for a hair follicle test to come back clean?

Results for specimens that screen negative for all drugs are generally available within 48 to 72 hours after specimens are received at the laboratory. Results for confirmation testing of presumptive positive screens are usually available within an additional 72 hours.

What drugs can be detected in a hair test?

A hair follicle test can detect:

  • marijuana.
  • amphetamines, including methamphetamine, MDMA (ecstasy), and MDEA (eve)
  • cocaine.
  • opiates, such as heroin, codeine, and morphine.
  • phencyclidine (PCP)

What drugs do hair follicles test for?