How far back do employers check on a hair follicle test?

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.

How far can you go back on a hair follicle test?

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.

Can a hair follicle test go back 9 months?

Although there is no released research or tests, it is suspected that the body hair test can be detected much further back, as far back as a year. The results will not and can not detect the specific day of drug use. While urine tests can detect only one recent use, hair follicle tests can detect use over time.

What can cause a false positive hair follicle test?

Prescription medications and certain foods, such as poppy seeds, may contain compounds that might lead to false positive results. Hair samples undergo a two-step process to ensure accurate test results. The first step involves an enzyme-linked immunosorbent assay (ELISA) test, which is a rapid screening method.

Can a hair follicle test detect infrequent use?

Regular drug users may hate this. If an individual is an infrequent or first-time drug user, a hair follicle test may not detect drug use a few days before the test because it takes time for hair to grow. Employers need to weigh that fact into their choice of a drug test method.

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What shows up in hair follicle drug test?

The most common type of hair follicle drug test is the 5-panel drug test. This test works to detect cocaine, opiates, PCP, THC, and amphetamines.

What is an infrequent user?

Detection period

With respect to the three scenarios outlined, a person using an illegal drug once or twice over a weekend was considered an infrequent user, whereas the person using an illegal substance more than that over a weekend was considered to be a frequent user.