re: How precise are hair follicle tests?

It ain't hair follicle. It is a hair test. The follicle is below the skin. A positive result indicates significant exposure over and extended period of time. If what you are reporting is correct, and we're talking hair from the scalp, you're gonna pass. If the hair on your head is not 1.5 inches or longer, and they get body hair, the "window" of detection is far greater than 90 days. That could be a problem if you used a significant amount of illicit drugs 6 - 9 months ago.