Ultimately, the most rigorous traceability solutions, including QR codes and microchips, won't be useful if people don't actually check them as a condition of making their purchases. Imitators can simply counterfeit QR code labels, for example.
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例如,江苏省政府办公厅2016年公布的《关于解决无户口人员登记户口问题的实施意见》中规定,对于无法申领到《出生医学证明》的,本人或其监护人提供具有资质的鉴定机构出具的亲子鉴定证明,经公安机关调查核实后,办理常住户口登记。