Stadol won't show up as bupe. It'll show up as butorphanol (which is what Stadol is) and I doubt they even test for that.
They use to sell 50ml bottles of butorphanol from MX websites that sold Nubain (nalbuphine), Temgesic (.2mg bupe tabs) and Oxycontins that had EX on one side instead of OC so the DEA could trace where they originated from (or at least that's what I always heard was the reason they didn't say OC on them). Stadol, Nubain and Temgesic all can cause PWDs though so be careful messing with those 3 opiods. I actually liked Nubain back in the day. If you didn't have a tolerance or a habit, it worked great for pain (equal to morphine on an IV mg basis. ie: 10 mgs of nubain IV = 10 mgs of morphine IV) and gave a nice buzz IMO.
What's crazy is the Temgesics usually costed (know that's not grammatically correct) about $7 per pill from the MX sites so that's like paying $280 for an 8mg subutex. That's how I know how strong bupe is though 'cause I remember having a decent sized hydro habit back then and taking .2mgs of temgesic and not being sick all day. They also made .3mg amps of temgesic for IV use but never got a rush from those so I usually snorted the pills instead.