Here's a couple of resources for you:
Hair Follicle vs. Urinalysis Drug Testing: Breakdown By Company
That quote was posted by Brett Aquila on another thread about this same subject matter. I haven’t read any of those links due to not needing it. I’m sober many years. Maybe those links can help you out. All the best to you.
A CDL is required to drive any of the following vehicles:
Hair can be from anywhere on the body. If you go in with a freshly, 100% shaved, no hair body, that will be considered a failure/refusal to test.
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I was at Swift orientation today and part of the hiring procedure, was the urine drug test. The person performing the test explained in a few weeks, Swift will hair test instead. I am not sure how the test will be performed, if from the head, arm and at what length. I am assuming it is a more accurate test since some drugs show positive in urine only for a few days.