Prime is still just doing urine only at the moment.. Also the companies that hair follicle test can take the hair from other parts of your body if you don't have enough on your head.
Here's a couple of resources for you:
Hair Follicle vs. Urinalysis Drug Testing: Breakdown By Company
CDL Drug & Alcohol Testing Methods & Detection Times
A CDL is required to drive any of the following vehicles:
I'm with CFI, they do hair for company and urine for DOT. I didn't have enough on my head so she shaved my back and a stripe across my chest. Took a pic and sent it to my wife. She got a laugh. Good luck with Prime.
A department of the federal executive branch responsible for the national highways and for railroad and airline safety. It also manages Amtrak, the national railroad system, and the Coast Guard.
State and Federal DOT Officers are responsible for commercial vehicle enforcement. "The truck police" you could call them.
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The only reason why I ask is because I'm scheduled to start with Prime on December 27 and I'm not sure if my hair will be long enough or not.