1.   But a new round of cases is sure to arise as soon as acoustic sensors or video cameras are used outside of public spaces, legal experts say.

2.   Designed to fit in a backpack, the equipment includes a video camera on a stalk and four acoustic sensors to detect approaching footsteps.

3.   Hickling placed some of the ants in a plastic box with acoustic sensors on the bottom to measure the frequency of their noises.

4.   In Redwood City, the acoustic sensors are welcomed in the neighborhood where they have been installed.

5.   In Redwood City, Calif., the police department has set up acoustic sensors that will detect gunfire and locate it on maps at police headquarters.

6.   Phoenix is considering a system of acoustic sensors that supposedly can pinpoint gunfire within a few dozen feet.

7.   However, the belt of infrared detectors, acoustic sensors and watch towers installed near the old demilitarized zone failed to do the job.

8.   The project was a highly classified effort to detect Soviet nuclear weapons using balloons that carried radar reflectors and acoustic sensors, the GAO report said.