I smoked marijuana 18 days ago and am getting tested tomrw. The test is a sap 10-50/2000. That day I smoked twice for a total of a quarter Of a gram. And previously I only smoked a few times a month if that. I am 5 11 143 pounds. I have a hard time gaining weight so I assume I have a high metabolism because I eat a ton. I lift weights 4 days a week and run 5-7 miles once or twice a week. 2 weeks ago I bought a walgreens screening for thc and was negative. But I have read these do not test as strongly. What can I do to make sure I pass this urine test tomorrow.