Its control of each stage of production helps Smithfield to trace back any problems with pathogens and address them.

WSJ: What China Can Learn From America's Hot Dogs

They do not log any information except the current account balance and the bitcoins from many TORwallets can be mixed instantly to a single address in a single transaction to make them extremely difficult to trace.

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Often its efforts to trace families of account holders were thwarted as many accounts were opened only with a name and a postal address.

BBC: Jewish woman showing camp number