Philly Repels Teens from Parks with Sonic Devices

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Philadelphia teens who want to hang out in area parks and rec centers after hours may be subject to an Orwellian deterrent.

According to a report from Billy Penn, Philadelphia has been implementing a device called the Mosquito at its parks since 2014. Banned in many parts of the world, the Mosquito emits a constant noise at such a high frequency that only young people can hear it. 

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