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.
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.
Though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that may need monitoring such as bars, banks, casinos, schools, hotels, airports, hospitals, restaurants, military installations, convenience stores and other areas where security is needed.
Though Videotelephony is seldom called "CCTV" one exception is the use of video in distance education, where it is an important tool.
There are about 350 million surveillance cameras worldwide as of 2016. The growth of CCTV has been slowing in recent years. Very little is known about Vericon except it was advertised as not requiring a government permit.
In recent years, the use of body worn video cameras has been introduced as a new form of surveillance, often used in law enforcement, with cameras located on a police officer's chest or head.The development of reel-to-reel media enabled the recording of surveillance footage.These systems required magnetic tapes to be changed manually, which was a time consuming, expensive and unreliable process, with the operator having to manually thread the tape from the tape reel through the recorder onto an empty take-up reel.Even so, there is political hostility to surveillance and several commentators downplay the evidence of CCTV's effectiveness, especially in the US.Gill and Spriggs did a Cost-effectiveness analysis (CEA) of CCTV in crime prevention that showed little monetary saving with the installation of CCTV as most of the crimes prevented resulted in little monetary loss.