Jim Webster wrote:

these shouldn't be problems.
If you are dealing with a large acreage of a high value crop grow in
isolation then the cost of a dedicated combine and silo is irrelevant.
--
Jim Webster

Dealing with a highly profitable crop, you have to enter in the
realm of greed and human nature.
There are no existing regulations that forces farmers or traders
to have dedicated combines, silos, barges and ports.

There is no wall that can stop pollen to travel and its viability
depends on species and climatic conditions. Current isolation guidelines
are based on the contamination of the crop you are harvesting, not
in the neighbor's crop. After you harvest your isolated crop
you generally can and do test for outside germplasm contamination
(you grow it and find, test and discard off types) None of this is currently
done for the neighbor's crops, crop weeds and downstream irrigation channel's
vegetation. There are weeds that can intercross for example with wheat and the
seeds can travel in the irrigation water or stay in the ground for
years.
The story of the diarrhea drug works best when it is in its native form or
getting it to the target mid gut without it being broken down by digestive
enzymes, sounds research to suit the bottom line of some corporation and is
something that can be easily solved by encapsulation of the drug,
reformulation or by simply changing the diet of the pigs or the kind of
pigs.