Philly is still using that high-pitched sound called the Mosquito to deter teenagers from hanging out in public parks after 10:00 P.M. It's a frequency that only people between 13 and 25 can hear, and it's controversial. Here's a reporter, a teenager, a girl who's 27 and still hears it, and a city councilwoman who's against it.
When we played the audio on the air several listeners, who were older than 25, called to say they could hear it. can you?
Give the audio a listen below.