In addition to the many other products and services TSSI (Booth #30103) is displaying at SHOT Show, they are displaying Droneshield. Just this morning, reports of a drone sighting at Newark International Airport resulted in cancelled flights.
While the government continues to make decisions about who will be given the authorities to defeat drones (DroneGun Seen above), Droneshield has detection systems named DroneSentry and DroneSentinel which could have verified if a drone was present in the airspace and characterized it. They combine radar, RF sensors and EO/IR sensors.
They are passive, readily available on GSA Schedule and rapidly deployable. In fact, they are regularly deployed for events such as the Winter Olympics, Boston Marathon, NASCAR and other large public gatherings.