I took a DOT drug screening on 01/13/12, had stopped smoking for 14 days prior to the screening and I was smoking high grade smoke every other day via gravity bong (Vortex). 2 hours before taking the exam I drank approximately a gallon of water and took a detox cleansing drink called Total Eclipse Rely Detox that I purchased from GNC followed by a 1.5 liters of more water. When I arrived at the testing site I gave a urine sample that was clear with a hint of lime, the MRO than took my sample and pour it into two containers and commented on how I must take my vitamins upon viewing the sample. I wish I had come across this forum prior to my exam cause I would have taken some extra steps to prevent from testing positive but my concerns are if I did enough to pass this drug screening, I'm in my low 30s 5'8 and weight 165 lbs, I exercise moderately and am not overweight or thin. I would appreciate and be thankful for anyones's expertise on this matter.