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For years now Chinese authorities have been installing spying devices on all dual-plate Chinese-Hong Kong vehicles, enabling a vast network of eavesdropping across the archipelago, according to a Hong Kong newspaper.

The report in Apple Daily states that the recording devices began being installed as “inspection and quarantine cards” in July 2007. They were installed without charge by the Shenzhen Inspection and Quarantine Bureau on thousands of vehicles.
more big brother surveillance stuff going on...moving us into the that police state.