48 hour clean urine exam. Step 1: stop smoking weed. Step 2: Drink 1 gallon of lemonade in 12 hours, take 1 (325mg) aspirin every 2 hours, and eat fat rich foods. Step 3: Drink 1 half gallon of water in 4 hours, 1 aspirin every 2 hours, and eat fat rich foods. Step 4: Sleep for 8 hours. Step 5: Drink 1 gallon of lemonade in 6 hours, 1 aspirin every hour, and eat super fatty foods (straight bacon fat). Step 6: Drink 2 gallons of water in 18 hours, take 1 aspirin and multivitamin every hour, and eat super fatty foods.
Basic your body stores the THC metabolite in your fat, which shows up in your urine as your blood cell die. All I do is clean my bladder with lemonade(high Vit C drink) and water (I cover up the cleaning with the multi-vitamin), thin my blood, and prevent my body from burning the stored fat which has the THC in it.