
The term "smoking gun" is a reference to an object or fact that serves as conclusive
evidence
Evidence for a proposition is what supports this proposition. It is usually understood as an indication that the supported proposition is true. What role evidence plays and how it is conceived varies from field to field.
In epistemology, eviden ...
of a
crime
In ordinary language, a crime is an unlawful act punishable by a state or other authority. The term ''crime'' does not, in modern criminal law, have any simple and universally accepted definition,Farmer, Lindsay: "Crime, definitions of", in Ca ...
or similar act, just short of being caught ''
in flagrante delicto
''In flagrante delicto'' (Latin for "in blazing offence") or sometimes simply ''in flagrante'' ("in blazing") is a legal term used to indicate that a criminal has been caught in the act of committing an offence (compare ). The colloquial "caught ...
''. "Smoking gun" refers to the strongest kind of
circumstantial evidence
Circumstantial evidence is evidence that relies on an inference to connect it to a conclusion of fact—such as a fingerprint at the scene of a crime. By contrast, direct evidence supports the truth of an assertion directly—i.e., without need ...
, as opposed to
direct evidence. Direct evidence would include the entire action; i.e. the action of pulling the trigger, firing the gun, and the victim falling.
Phrase origin
The phrase originally came from the idea that finding a very recently fired (hence smoking) gun on the person of a suspect wanted for shooting someone would in that situation be nearly unshakable proof of having committed the crime. A variant of the phrase (as "smoking pistol") is used in the
Sherlock Holmes story, "
The Adventure of the Gloria Scott" (1893).
Extended meaning
In addition to this, its meaning has evolved in uses completely unrelated to criminal activity: for example, scientific evidence that is highly suggestive in favor of a particular hypothesis is sometimes called "smoking gun evidence".
See also
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Legal burden of proof
In a legal dispute, one party has the burden of proof to show that they are correct, while the other party had no such burden and is presumed to be correct. The burden of proof requires a party to produce evidence to establish the truth of facts ...
*
References
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Metaphors referring to war and violence
Metaphors referring to objects
Evidence
Forensic evidence
Gun
English phrases