smoking gun

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smoking gun

Drug slang
A regional street term for heroin and cocaine.
 
EBM
A metaphor referring to the definitive confirmation of a cause-and-effect relationship.
 
Forensics
A term for an object or fact that provides conclusive evidence linking a perpetrator to crime or criminal act, the premise being that if the gun used to injure or kill someone is still smoking (or recently discharged) and on the person accused of firing the weapon, that person almost certainly committed the crime.

'smoking gun'

Decision-making adjective A metaphor for a definitive confirmation of a cause-and-effect relationship
References in periodicals archive ?
We have the smoking guns in his case and the witnesses show that one person was involved - Harold Wiener,'' Sacks argued during a closing statement.
This leads to the ironic conclusion that--like not shredding paper documents--companies must retain their emails, even if they're keeping a smoking gun on their hands.
If any villain has been caught with a smoking gun during these three years of intense study, it's not sulfur or nitrogen in acid deposition, but ozone.