
Three seconds of audio could end up costing Fox $504,000
And that, kids, is why we don't play the Emergency Alert System tone on TV
The US's Emergency Alert System's distinctive alert sound is protected by law from being used outside of the EAS system. The distinctive sound is actually two simultaneous tones, 853Hz and 960Hz.
The FCC protects the use of that tone and actively hunts for illegal use of the tone. The goal is to ensure that people don't get desensitized to the sound and ignore it when an actual emergency message is broadcast.