"It can trace the whole production and circulation process," he said.

"If any problem occurs, law enforcement officers can take countermeasures in the shortest period of time."

Chen Xiaoying, deputy director of the system's promotions office, said the system also safeguarded consumers' rights to know about their purchases.

She said the system already covers more than 700 million products from 30,000 companies across the country, and is expanding rapidly.

"We're now busy installing service terminals in stores and supermarkets," she said.

Quality control officers yesterday demonstrated how the terminals work in a pilot store in Beijing's Chaoyang district.

As soon as a cashier scanned a product's tracking code information about it, including a picture, its name, producer, production date, expiry date, batch number, seller and price, appeared on screen.

If there is anything wrong, such as if the product has expired, it cannot be sold and an alarm will ring.

Also, reports of any prohibited products are automatically transmitted to the local qual

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