Noun
indisputable evidence (especially of a crime)
Source: WordNetThe problem here is that there will always be some uncertainty about how quickly Saddam can acquire nuclear weapons. But we don't want the smoking gun to be a mushroom cloud. Condoleezza Rice
Our task, your task... is to try to connect the dots before something happens. People say, 'Well, where's the smoking gun?' Well, we don't want to see a smoking gun from a weapon of mass destruction. Donald Rumsfeld
America must not ignore the threat gathering against us. Facing clear evidence of peril, we cannot wait for the final proof, the smoking gun that could come in the form of a mushroom cloud. George W. Bush
We have it. The smoking gun. The evidence. The potential weapon of mass destruction we have been looking for as our pretext of invading Iraq. There's just one problem - it's in North Korea. Jon Stewart
I think there ought to be some serious discussion by smart people, really smart people, about whether or not proliferation of things like The Smoking Gun and TMZ and YouTube and the whole celebrity culture is healthy. Stephen King