Police in North Staffordshire are using a high-pitched “dog whistle” device , also called The Mosquito for obvious reasons, to stop groups of nuisance youths hanging around shops.
Interestingly, the Whistle’s output of 80-decibel frequency noise can only be heard by teenagers and those in their early 20s.
It costs £622.
A handy crowd control tool, indeed.
A whistle to keep the crowd away
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