Seeds are often treated with pesticides. Insecticides, and fungicides are common
This link describes it better than I can but if the seeds were treated it should be listed on the freight bills. There may not be a reportable quantity and thus won’t need placards but any amount of an organo-phosphate can be deadly.
You can thank the huge multi-billion dollar California agricultural lobbyists for the lack of oversight.

Organophosphate – Wikipedia



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