Make sure when you test yourself you use the first urine of the morning. If you can pass that you should be able to pass a drug screen. And as far as I know they only contact you if you fail or they have a question about your sample. I took a test 8 days ago and have heard nothing, except welcome to the company see you at orientation, so I think I passed, so the one thing I know is that if you don't hear anything assume you passed and ask for your start date, or if they need anything else, but don't ask about the drug screen.