A gadget aimed at stopping teenage gangs from hanging about outside shops has been switched off over fears that it affects kids' human rights.
The gadget - called a Mosquito - sends out high-pitched sound waves which can be heard by most people under 20, but which hardly register with over 30s.
It was put up outside a shop in Newport, Wales - and shopkeepers reported an 84% drop in bad behaviour.
But the Mosquito has now been swatted while further investigations are held.
Younger people are affected more because your hearing usually gets worse as you age, meaning you can't hear high-pitched noises as well.
A police spokesman said: "It was decided by the Newport Community Safety Partnership that, before endorsing the device, issues regarding health and safety and human rights need to be resolved."
A spokesman for the shop described the move as "absolutely disgusting".