I can tell you for sure that hydro will NOT show up on the drug test under opiates. Just took the 5 panel test and it can back negative for opiates. I have been taking about 40 to 50mg hydro for a long time and also took my meds the day of the test and sample was given about 2:30pm.
I also have an opinion I would like to post. With all the media around the increasing number of cases of pain relivers such as vicodin etc. being abused and overdosed I think that it will be added to the drug test very soon. It's just my opinion, as I have not heard anything about it being added.

tiger47