I finally had the test today! My scalp and ears are shot! It was quest diagnostics lab which I wasnt expecting. Anyone have any experience with them and what there cut off levels are? I am also attaching a quote with some new info I found about humidity and thc levels. If you are in a humid place you may be in luck! "Hair strand testing detects the presence drug metabolites that have passively diffused from the blood stream to the base of the hair follicle. Critics of this troublesome technology rightly argue that the test is biased by both race (e.g., The tests is more sensitive to minorities and people with darker-colored hair) and age (e.g. Grey hair uptakes fewer metabolites than normally colored hair). While studies have indicated that marijuana metabolites do not bind sufficiently to hair compared to other drugs such as cocaine – read: occasional cannabis consumption may go undetected on a hair test – recent research also indicates that exposure to high humidity will rapidly break down marijuana metabolite levels in the hair of heavier smokers, increasing the likelihood of a negative result"