It depends on what kind of drug test it is. The NIDA 5 stanard urine test only tests for
morphine, which is a metabolite of heroin and
codeine, but not
oxycodone (which I believe is derived from Thebaine). If it is a NIDA 5 (which is most common for job applicants) there should not be a problem. However, if it is an extended drug test, it will almost certainly show up, as oxy has been a popular drug of abuse w/ a lot of media attention, and if you don't have a scrip for it, there will be little recourse, as I am unaware of any non-narcotic substances that would cause a false + for oxy.
Information = Freedom