positive vetting

British  

noun

1. the checking of a person's background, political affiliation, etc, to assess his suitability for a position that may involve national security

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Example Sentences

In 1965 MI5 resisted a view from the Treasury that homosexuality should be an absolute bar to any kind of public office that required positive vetting.

From BBC

Or one could conceivably do a thorough positive vetting on all the sysadmins.

From Forbes

Since 1952, Macmillan admitted, the Foreign Office has instituted "positive vetting"�before then, a man was investigated only if he had already come to the "unfavorable notice" of the security officials.

From Time Magazine Archive