The rotating police light is almost never used for actual police reports online — it's the internet's universal 'PSA' flag, slapped onto tweets to mean 'urgent, pay attention' or, ironically, 'drama alert' before spilling gossip. Its exaggerated red glow makes it read as alarm rather than authority, which is why it thrives as a tone-setter more than a literal cop reference.
Keywords: alarm, alert, beacon, car, emergency, light, police, revolving, siren