About the food traceability?

Producer using a batch id for identifying a lot of produces and then he sends it to the manufacturer. Now manufacturer buys the produces from many producers and then he process and packed and send it to the next stakeholder like wholesaler, distributor, retailer, etc. 

My question if a consumer wants to trace a vegetable to see the origin of the product. how he/she can see that. If every produces from different producers gets mingle in the manufacturer process how consumer can trace it. pls help to understand it.

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