does anyone know how accurate the at home drug test from CVS is. i smoked once a day for months and stopped 3 1/2 weeks ago. the test says even if the second line in faint it is still negative and i had a faint second line. i was smoking about 5 hits of medium grade weed a day thru a pipe. i an 18% body fat and have fast metabolism. i have to take a test tomorrow.