LINCOLN, Neb. (AP) — The Nebraska Supreme Court has rejected a killer’s appeal challenging the use of “shot-spotter” technology that records gunfire, pinpoints its origin and notifies police of it.

Thylun “Jay” Hill, of Omaha, is serving life after being convicted in 2013 of first-degree murder the February 2012 shooting death of Anthony Carter.

Hill argued in his appeal that evidence from the shot-spotter system should not have been admitted at his trial. He questioned whether the system had been properly tested and if police improperly relied on information it provided.

The high court dismissed those arguments Friday as “somewhat dubious,” saying officers reported hearing the gunshots at the same time the system recorded them and that Carter was found at the location pinpointed by system.