Who / How Can A Drone Be Detected?

With drones becoming more prominent, they increasingly become a security risk. The most obvious example is airplanes / airports but many high security facilities are at risk to drones conducting spying / intrusions into their space.

What can be done?

The only company I have seen so far claim to detect drones is SpotterRF, see video below:

Anyone have any other ideas or experience in this area?

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