ok i can answer this. i was in charge of pre employment drug screens at work. first off the standard drug screen is what is called a 5 panel.it looks for pot,speed,crystal meth,heroin ,which metabolizes to morphine, codiens cocaine and alcohol.......oxy,hydro are not in the search area of this test. now most emplyers are asking for a additional test to be conducted called a "home" opiate test. this test stricky searches for oxy hydo etc..........only then will sub show up.