I am a concerned parent. My son is going for a drug screening for a job.I need some answers,because I am very worried,he needs this job.Is there any thing we can do to get it out of his system quickly?I can't believe that he done this 2 days before this test is to be done.He has restless legs and he got this from a friend to see if it would help,not thinking about this screening that is coming up.Any help would be appreciated.