i used to be a weed smoker heavy years ago. i have not smoked again until last tue and thurs, six pull in total. fri morning i received a phone call that i was going to have a drug test on monday morning ( today) after receiving this phone call i immediately started taking niacin, zinc, cerrasse, alot, alot, alot of water and this morning before the actual drug test i took ready clease. when the test was done i came home and took an at home drug test which tested negative. how accurate is the at home drug test and do you think i could have passed the test. please mature answers only.