Hair Drug Test
- Hair testing can detect drugs up to 90 days after use.
- They’re nearly impossible to cheat.
- Shampoos can’t mask a drug’s presence in your hair.
- Secondhand smoke does not lead to a positive hair test.
A standard 90-day hair test requires a donor to provide a sample that is 1.5 inches long. If a donor shaves their head prior to the test, a screening facility can perform the test with body hair. The body hair test can go back twice as far as a test with head hair and determine the person’s drug use during that time. If no hair is available, a urine test is the only way to screen that person.
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