The Department of Homeland Security says it developed a portable gunshot detection system

The Department of Homeland Security (DHS) says its Science and Technology Directorate division has created a portable gunshot detection system with the help of a company called Shooter Detection Systems (SDS). The agency notes that whereas other systems only detect audio, SDS Outdoor can pinpoint flashes of gunshots as well. DHS claims this approach can reduce false positive rates. DHS has not disclosed details about the accuracy of the system. SDS, which is owned by Alarm.com, says its indoor gunshot detection system has a near-100 percent detection rate with fewer than one false alert per 5 million hours of use.