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Second, some have noted that, in many of the studies, there may be issues with selection bias since the introduction of CCTV was potentially endogenous to previous crime trends. In particular, the estimated effects may be biased if CCTV is introduced in response to crime trends. 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. Another question in the effectiveness of CCTV for policing is around uptime of the system; in 2013 City of Philadelphia Auditor found that the $15M system was operational only 32% of the time. There is strong anecdotal evidence that CCTV aids in detection and conviction of offenders; indeed UK police forces routinely seek CCTV recordings after crimes. Moreover, CCTV has played a crucial role in tracing the movements of suspects or victims and is widely regarded by anti terrorist officers as a fundamental tool in tracking terrorist suspects.

 

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It makes the dome design the most inconspicuous design. In business, that has an advantage of not unduly disturbing the customers. Less obvious to know what direction the camera is pointing to Because of the tinted dome, it may be quite difficult to ascertain what direction the camera inside is pointing to. This adds an additional degree of uncertainty to the attempted mischief. And if the potential perpetrators hate something, it is uncertainty. So they will think twice before attempting their act. by: Luciferrticle Source:and gizmos/article 3184. shtmlOf the thirteen Verizon Android phones the The HTC ThunderBolt is currently their premier phone. Other popular Verizon Androids are the Motorola's Droid 2 and the HTC Droid Incredible 2. However, these two phones don't sport the 4G connectivity, while the ThunderBolt does. From a physical point of view the ThunderBolt is fairly heavy 6.