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[note 6] Scientific Working Group on Imaging Technology, Recommendations and Guidelines for Using Closed-Circuit Television Security Systems in Commercial Institutions, Version 3.0, June 8, 2012.

Danger Do Not EnterTape

Danger Hazard Area Do Not Enter Signs are used for being displayed around areas where it is necessary to warn people of the hazardous area and that entry is not allowed and conveys 2 messages of "Danger hazard area" to warn of the hazardous area and "Do not enter" not allowed to enter the hazardous area.

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A Danger Hazard Area Do Not Enter Sign is a hazard warning and prohibition message type of dual message sign which is generally used for being displayed around areas where it is necessary to warn people of the hazardous area and that entry is not allowed and the sign conveys 2 messages which are "Danger hazard area" which means to warn of the hazardous area and "Do not enter" which have the meaning of people are not allowed to enter the hazardous area.

Do Not EnterAuthorized Personnel Only

[note 3] Lum, C., et al, Research on body-worn cameras: What we know, what we need to know, Criminology & Public Policy, pp. 93 – 118,  March 24, 2019

Developed by the NIJ-funded NLECTC Sensor, Surveillance and Biometric Technologies Center of Excellence, A Primer on Body-Worn Cameras for Law Enforcement provides an introduction to body-worn camera systems. The  report discusses the functions and features of body-worn camera systems and highlights issues and factors that law enforcement organizations should consider before and during implementation.

Do Not Enter signmeaning

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Research does not necessarily support the effectiveness of body-worn cameras in achieving those desired outcomes. A comprehensive review of 70 studies of body-worn cameras use found that the larger body of research on body-worn cameras showed no consistent or no statistically significant effects.[3] This meta-analysis was rated by CrimeSolutions and resulted in a No Effects rating for the impact of body-worn cameras on use of force, assaults on officers, officer-initiated calls for service, arrests, traffic stops and tickets, and field interviews (i.e., stop and frisk). See Practice Profile: Body-Worn Cameras’ Effects on Police Officer Behavior. This profile is based on a meta-analysis published in 2020.

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These mixed findings are further reflected in findings from evaluations of ten body-worn camera programs that have met the stringent criteria for inclusion in NIJ’s CrimeSolutions, see Table 1.[4] Across these evaluations, researchers looked at a range of outcomes, including use of force, citizen complaints, arrests, and assaults on officers. Four of the body-worn camera programs evaluated were found to have no, limited, or even negative effects.

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VGA, HD 720P, and 1080 HD are predominant standard resolutions. The higher the resolution, the more storage is needed. Estimates below were created assuming H.264 compression with medium to high motion at 30 frames per second (fps) derived using a heuristic formula widely used in industry. Actual storage utilized is dependent on scene complexity and the motion of the video captured. Consider what sort of analysis may be conducted on the video before selecting a resolution. For example, if forensic video analysis is anticipated, a resolution less than VGA is not recommended.

Based on these reviews and the existing research on the impact of body-worn cameras use, it is clear that further research is essential to determine the value of body-worn cameras use and potentially the more effective ways body-worn cameras could be deployed. Given the growing use of body-worn cameras, it would be best to build in rigorous evaluations as law enforcement agencies expand their use of this technology.

[note 2] Hyland, S., Body-Worn Cameras in Law Enforcement Agencies, 2016, Bureau of Justice Statistics, November 2018. Note that this survey excluded federal agencies, sheriffs’ offices with only jail or court duties, and special-purpose agencies such as transit police and campus police.

[note 4] CrimeSolutions is the NIJ-funded federal clearinghouse of evaluation research, showing what works, what does not work, and what is promising across broad expanses of criminal and juvenile justice programs and practice. Learn more about CrimeSolutions.

In November 2018, the Bureau of Justice Statistics (BJS) published a report on the use of body-worn cameras by law enforcement agencies in the United States in 2016.[2] This report showed that:

[note 1] RCTs provide the highest degree of confidence that observed effects are the result of the program and not of other factors.

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Do Not EnterWithout PermissionSign

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According to the 2018 BJS report, the main reasons (about 80% each) that local police and sheriffs’ offices had acquired body-worn cameras were to improve officer safety, increase evidence quality, reduce civilian complaints, and reduce agency liability.

[note 5] Home Office Centre for Applied Science and Technology, Body-Worn Video Technical Guidance (pdf, 10 pages), May 2014

Body-worn cameras are widely used by state and local law enforcement agencies in the United States. They are worn principally by officers in the performance of duties that require open and direct contact with the public. Despite their widespread and growing adoption, the current evidence regarding the effectiveness of body-worn cameras is mixed. Some studies suggest that body-worn cameras may offer benefits while others show either no impact or possible negative effects. The mixed results of these studies strongly imply that additional research is needed. In particular, more studies employing randomized control trials [1] are needed.

Agencies should consider how body worn cameras will meet their mission needs and requirements prior to procurement and use of the technology. To provide general guidance to law enforcement practitioners, NIJ, NIST and the FBI developed a table listing operating characteristics and associated functionality descriptions based on existing technical resources about criminal justice use of video.[5],[6] The operating characteristics and associated functionality descriptions in the table can help agencies determine what they need as they consider the commercial products available.