PORTLAND, Ore. (AP) — To help combat a growing gun violence problem, the mayor of Portland, Oregon, is launching a system proponents say can track the location of gunshots using hidden microphones. Oregon Public Broadcasting reports a panel recommended the city adopt ShotSpotter in a July report. Stephanie Howard, Mayor Ted Wheeler’s director of community safety, said Thursday the decision to advance a pilot program with the technology was made after Wheeler met with Police Chief Chuck Lovell. ShotSpotter says it can identify and locate gunshots in real-time using small microphones placed in neighborhoods. Police could then use that data. Critics say the technology is unreliable.