A new "ShotSpotter" system is live in North St. Louis County after being tested by officers earlier this month.
The system uses a network of sensors to locate gunfire in a four-mile radius. Once a gunshot is detected, the system will send the information to officers on patrol.
The area the system covers is in the Castlepoint Neighborhood just south of I-270.
Chief Jon Belmar wouldn't go into detail on where sensors are located, however he did say officers have already noticed a big difference since the system launched on Monday.
"We've actually had officers almost be around the corner, come into those areas, make one arrest out of this so far," Belmar said. "It's going to be a vital tool as we move forward.
Chief Belmar said the system will be able to differentiate between fireworks and gunshots over the Fourth of July weekend.
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