It's okay if you had a rx for it.
I don't know how long it takes to clear it out of your system, but it should be google-able.
You will likely test positive.
no it would not still be in your system if you took it over a month ago. pain pills only stay active in your system for up to two weeks. now lets say you took it a week ago all you would need to do is detox and it would be out of your system before the two weeks.
Depends on the test. A hair sample would show positive.