My 23 year old son has been in rehab twice in the past two years and was released from the last treatment center 3 months ago. His drugs of choice were hydrocodone, oxycontin, methamphetamine, and marijuana. He has started to fall into old patterns that make his wife and I concerned that he may be using again. He maintains that he is clean, and has agreed to take a 12 screen urine drug test. My question is if his prescribed medications (doxepin as a sleep aid, clonazapam for anxiety, and zoloft for depression) will show up on the screen and if so, under what categories (ie: opiates, barbituates, etc.)?