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ONOSCOPE – small instrument sometimes used in
examining the internal surface of the gun barrel.

ONUS PROBANDI – the obligation imposed upon a
party who alleges the existence of a fact or thing
necessary in the prosecution of defense of an
action, to establish its proof.

OPEN SIGHT – any sight in which there is no tube or
aperture through which aim is taken.

OPEN TECHNIQUE – an interrogation technique
whereby the interrogator is open and direct in his
approach and makes no attempts to conceal the
purpose of the interrogator. It is best employed
when the interrogee is cooperative. It is frequently
used at the tactical level where time is a major
interrogator.

OPEN-SOURCE INTELLIGENCE (OSINT) – refers
to a broad array of information and sources that
are generally available, including information
obtained from the media (newspapers, radio,
television, etc.), professional and academic records
(papers, conferences, professional associations,
etc.), and public data (government reports,
demographics, hearings, speeches, etc.).

OPERATIONAL DOCTRINES – principles and rules
governing the planning, organization and direction
and employment of the police forces in the
accomplishment of basic security operational
mission in the maintenance of peace and order,
crime prevention and suppression, internal security
and public safety operation.

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