A number of new electronic surveillance systems have emerged in the aftermath of Sept. 11, such as so-called ghost phones that look like regular cell phones but can actually transmit sounds while appearing to be switched off or broken.
However, several infringements could be potentially linked to this technology because it uses local phone company lines, so users need to be cautious.
Cellular video surveillance such as that provided by VivaMacro allow officers to remotely supervise particular locations, and can also be used to send pictures to a secure Web site.
Wireless aerial video surveillance systems like those from Pacific Microwave Research typically rely on cameras attached to helicopters or airplanes, and operate between 2200 MHz and 2500 MHz.
Another firm, Dotworks Systems, provides wired or IP-based video surveillance cameras that are small enough to be easily hidden inside special domes. The cameras feature robust zoom lenses that can view objects half a mile away and work well in low light.
Digital surveillance cameras from Vision Technology in Rogers, Ark., feature indefinite focus lenses, eliminating the need for moving parts or software to keep targets in focus and providing excellent depth of field.
And the FCC recently designated the 4940-4990 MHz band for fixed and mobile wireless services for public safety, allowing new broadband applications such as high-speed digital technologies and wireless local area networks for incident scene management, dispatch operations, and personal/vehicular communications.
Abstracted by the National Law Enforcement and Corrections Technology Center(NLECTC) from the Police (10/04) Vol. 28, No. 10, P. 38; Davis, Bob.