unsub n. Unsub is shorthand for “unknown subject,” meaning the person believed to have committed the crimes. Nor is it new. There was a 1989 series called Unsub, which followed a government unit investigating serial killers. [EnglishPoliceJargon] [full cite] (Apr. 12, 2006)
unsub n. Button Up and four other “unsubs"—FBI shorthand for “unknown subjects"—together are thought to be responsible for more than 30 robberies, nearly one-third of the bank robberies committed in Washington since January. [EnglishPoliceJargon] [full cite] (May. 12, 2006)
VASCAR n. The Connecticut State Police are patrolling in traditional and non-traditional cruisers, using all forms of speed enforcement (including radar, laser and the stopwatch-assisted method known as VASCAR) as well as patrolling from the air using small planes. [EnglishAutomobiles & TransportationPoliceAcronym] [full cite] (Dec. 27, 2007)
visible minority ethnics n. The Metropolitan Police will no longer describe black people as black, as part of a new attempt to counter charges of racism in the force. Both black and Asian people will in future be referred to as “visible minority ethnics.” [EnglishUnited KingdomPoliceJargon] [full cite] (Dec. 26, 2004)
welfare check n. Because of the woman’s apparent haste in entering the building, the officer reportedly turned around and drove back to the convenience store to make a “welfare check,” a police term for making sure there were no problems that might need police intervention. [EnglishPolice] [full cite] (Mar. 25, 2005)
wheels up adj. But the minute the last leader’s white-topped helicopter took off at the crack of dawn Friday—went “wheels up,” in the parlance of law enforcement officers—coastal Georgians rushed to resume normal summertime activities, such as basking on the beach instead of in the international spotlight. [EnglishUnited StatesAviationPoliceJargon] [full cite] (Jun. 14, 2004)
witness mark n. The location, shape and dimensions of this rectangle of witness marks [impressions on Mrs. Borsack’s shirt] clearly matches the width and shape of the seat belt webbing. [EnglishPolice] [full cite] (Aug. 9, 2007)
witness mark n. When recovering evidence for further observation, preservation of any dirt or grease mark on samples can be vital if critical evidence of its past history is not to be lost. Such trace evidence (witness marks) can help in reconstructing past movements of the sample, such as contact with older, perhaps mating parts. [EnglishPoliceJargon] [full cite] (Aug. 9, 2007)
witness mark n. There may be witness marks (scrapes and gouges) on the road surface that may suggest a post-impact movement of a vehicle. [EnglishPolice] [full cite] (Aug. 9, 2007)