being a prior marine and have done the meps thing once or twice it all depends on your body, I would recommend lay of the lettuce go buy some at home drug test and monitor your progress if you can piss clean on your first void of the day then you are good. at home piss test are same as the one at meps 50ng cut off limit. so if you can pass at home you will be able to pass at meps and go have fun for 13 weeks in san diego or parris island if you don't get dropped.