Hmmm. From plant to combine/harvester, to wagon, to bin, to truck, to elevator, to railcar/barge, to mill, to bag should be an approximate path. I'd say that s

Hmmm. From plant to combine/harvester, to wagon, to bin, to truck, to elevator, to railcar/barge, to mill, to bag should be an approximate path. I'd say that someone peeing on the bag is most likely to be a problem and you'd notice that. In all other cases, a single person peeing on a couple tons of grain isn't very likely to matter. The ground up dead rats probably affect it more. IOW, there are bigger things to worry about.