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Although based in Arlington, Virginia, CACI International has more than 120 branches and employs around 15,000 people throughout the U. S. and Europe. The firm’s area of expertise is information technology, and it provides, in its own words, “information solutions and services in support of national security missions and government transformation for intelligence, defense, and federal civilian customers. ” CACI International plays a role in assisting with matters concerning global threats and the readiness of America’s armed forces. In 2012 the company’s revenue was $3.

 

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It has been argued that problems of selection bias and endogeneity can be addressed by stronger research designs such as randomized controlled trials and natural experiments. A 2017 review published in Journal of Scandinavian Studies in Criminology and Crime Prevention compiles seven studies that use such research designs. The studies included in the review found that CCTV reduced crime by 24 28% in public streets and urban subway stations. It also found that CCTV could decrease unruly behaviour in football stadiums and theft in supermarkets/mass merchant stores. However, there was no evidence of CCTV having desirable effects in parking facilities or suburban subway stations. Furthermore, the review indicates that CCTV is more effective in preventing property crimes than in violent crimes.