Hi there ~
I understand your concerns. Yes, many drugs can give you false positive tests on the urine or serum tox screen. It might be helpful to get another test done so as to confirm or refute the presence of the drug in your system. I also believe that you might need to know that opioids screen can be positive if you have been using cocaine. I also believe that you need to consult a psychiatrist
to get a letter from his or her office to make sure that your work is not affected, especially if you do not have physical symptoms. Having to attend a rehab program may be helpful, to retain your job, by applying for short term disability
. I wish you the best in your recovery.
I hope this helps. Take care and have a lovely day!