Maybe I'm missing something but wouldn't it just be a matter of blocking or scrambling the radio frequencies on which these remote-control toys operate? Everything that operates in the radio frequency (e.g. cell phones, TV signals, walkie-talkies, CB radio) is allocated a frequency range for operation.
Also, federal law prohibits the use of any device that could be used to jam or interfere with the GPS signals that drones rely on for navigation.Well, there you go. The sky's the limit over at Three Mile Island, boys.