Hello Grasscity, this is my first post on the site. I go to private school and tomorrow starts red ribbon week (this stupid thing where they talk about how marijuana, alcohol, and drugs are bad) and everyone knows we will get tested. Last time I smoked was exactly 3 weeks ago, tomorrow 22 days, and the time before that was a week earlier. I am 15 ½ and weigh 125 pounds. Now I am sure that I won't fail the test, but my question is: When people say it takes x amount of days for marijuana to get out of your system do they mean that all of the THC-COOH will have been excreted from your body, or that the content will be below the standard 50 ng/ml? Sorry if it's a confusing question, but it would be comforting to know an answer with scientific proof. I am a little paranoid because this is my first test, and want to pass so that I can get stoned after it