Maybe this is why people have chains and peep-holes on their doors, and sometimes a locked turnstile and an armed security guard downstairs.

也许，这就是为什么人们不仅要在自己家的门上装上锁链和猫眼，有时还在楼下装上旋转栅门和配上带枪的门卫。

youdao

Ed Bedington, editor of Meat Trades Journal, says the Findus horse meat case has brought into question the security of supply chains.

BBC: Horsemeat scandal: How often does food fraud happen?

However, there may be limits to what can be accomplished, as supply chains and security procedures are tightened.

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Radio frequency identification (RFID) tags have been used by companies such as Wal-Mart and Gillette to monitor their supply chains and increase security of their stock.

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