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6.1.D. - Page 9 <br /> METHODOLOGY <br /> The Grand Jury conducted an extensive survey of police agencies in San Mateo County to <br /> determine: <br /> • The types of surveillance technology used in the jurisdiction <br /> • The agency's policies for collecting, managing, and storing surveillance data <br /> • The precautions taken by the agency to ensure public awareness <br /> • Any forthcoming plans by cities or the County for ordinances related to the purchase and <br /> deployment of new or borrowed surveillance technology <br /> The Grand Jury also consulted local, state, and federal government websites for background <br /> information, and reviewed relevant publications. <br /> GLOSSARY <br /> Automated License Plate Readers (ALPRs): These computer-controlled, high-speed camera <br /> systemsgenerally mounted on police cars or on fixed objects such as light poles <br /> automatically capture an image of every license plate that comes into its view. ALPRs record <br /> data on each plate they scan, including not only the plate number but also the precise time, date <br /> and place it was encountered.4 <br /> Body-worn cameras (BWCs): These small cameras worn by law enforcement officers record <br /> audio and video. Some types of cameras are always on; other types can be turned on and off by <br /> the wearer. <br /> Cell-site simulators: These devices, commonly known as International Mobile Subscriber <br /> Identity(IMSI) catchers or"Stingrays,"mimic cellphone towers, forcing nearby cellphones into <br /> connecting to the device. The cell-site simulator logs the IMSI numbers of cellphones in the area <br /> or captures the content of communications.5 <br /> International Mobile Subscriber Identity(IMSI) catchers: These devices are used in the United <br /> States and other countries by law enforcement and intelligence agencies to intercept cellphone <br /> traffic and track the movements of cellphone users. <br /> ShotSpotter: These systems detect and send the location of gunfire or other weapons using <br /> acoustic, optical, or other types of sensors. <br /> Video surveillance: These camera systems are used to observe and record activities, with or <br /> without audio, in public spaces. Live camera feeds can spot crimes in real time, and video <br /> recordings can be used in investigations and at trial. <br /> 4"Street-Level Surveillance:Automated License Plate Readers,"Electronic Frontier Foundation,accessed May 23,2017. <br /> https://www.eff.org/sls/tech/automated-license-plate-readers. <br /> 5"Street-Level Surveillance:Cell-site Simulators,"Electronic Frontier Foundation,accessed May 23,2017. <br /> https://www.eff.org/sls/tech/cell-site-simulators. <br /> 2016-2017 San Mateo County Civil Grand Jury 2 <br />