a smoking gun

a smoking gun

information which proves without doubt that someone committed a crime A smoking gun was found in the form of an incriminating memorandum and Walker was convicted of theft.
See also: gun, smoking
References in periodicals archive ?
But finding a smoking gun was never the inspectors' job.
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.
The time to deal with a child--via tutoring, mentorship, internships, or simply talking and listening--is before isolation and alienation place a smoking gun in their blood-stained hands.
I can't point to any one piece of evidence as a smoking gun and say 'here, this proves it.
The protester's idea of a smoking gun is an atomic device in a container, lined with lead, on a container ship parked in Los Angeles Harbor, then set of by an Iraqi terrorist.
Tobacco smoke is a smoking gun with overwhelming results of factual scientific and medical studies that determines passive or secondhand smoke is most hazardous to our health.