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.
Some analyse chemical bonds to compare them against genuine honey samples. Others analyse isotopes to determine where a product likely originated.
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Still, relatively low-tech responses to food crime are among the most useful.