Any label applied at the farm is likely removed during processing and packaging steps - and replaced by new labels. Chain of custody depends on human intervention.
Water absorption and photosynthetic processes embed a unique signature at the molecular level of a plant. The signature depends on plant type, farm location and growing conditions. Coffee grown in Costa Rica has a different signature than coffee grown in Brazil.
These signatures are passed along the food chain, from plants to animals and even on to humans. Our analyzers use the signature to trace the geographical origin of virtually any food or beverage, pure or processed. You can’t remove it, you can’t wash it off. It’s everywhere. Nature's Barcode.