If your test is a standard drug test for employment, they do not test for Methadone, and methadone and suboxone DO NOT show up as opiates, so you are safe. In order to test for Methadone it requires a specific, very expensive test to test for methadone metabolites, and since 9 out of 10 people who take methadone belong to a clinic, which despenses the drug legally, this drug is not on the standard drug test. The only time I would be worried is if you are a caretaker or nurse and they are running a 16 drug pannel test on you for employment. These tests are rare and far from standard. If you are testing for probation or for the state, they also do not test for methadone or suboxone on a routine basis. I would relax and go and take the test and not worry that it is going to show up in your system. As far as how long the drug takes to work its way through your system, its different for everyone, but the standard for methadone is about 2 wks. M-done has such a long half life and takes its sweet time working through your system. I hope this helped you.