What the lab tried to communicate to the NYPD was that the technology wouldn’t have prevented the Edwards tragedy. You see, the radio system will pick up any friendly gun within 600 feet. That means that when the other officers pointed their weapons at Officer Edwards their guns would have only told them that a friendly gun was in the general area. Well, they already knew that. They knew that at least three friendly guns were in the area. After all, they were holding them.