i have a.i.h. auto immune hepatitis,i came up positive for cocaine on a random drug screen,i work for the railroad,my primary doctor suggested to get a hair follicle test it came back negative,somehow both urine test and hair screen done at same lab,but railroad fired me anyway.railroad would not accept hair follicle,f.r.a. and d.o.t. don,t reconize hair screen,i don't do drugs!