A real cop would never admit to being one. So if you ask and he sez "yes", you can tell he's not a cop. If he sez "no" then he is a cop. Unless he's undercover, in which case he'll say "yes" to make you think he's really not a cop. Simple logic, people. Jeez.
A lot of hating on bubbles for being misinformed... I can't believe people were ripping into you that way bubbles, people make mistakes! Don't feel bad bro they think they have never made a mistake but they have.
Holy F people, move on about the undercover cop. The point here is to smoke in the privacy of your own home, if for nothing else do so out of respect for your neighbors who may not want themselves or children forced to see it.