I don't think there is such a thing as a "pure play" any more when it comes to trying to avoid all chemicals that have been introduced to the supply chain for commercial food production that will eventually be converted for organic use. Be sure you compost that chicken manure before using it or you'll burn your crops. Composting helps break down a lot of nasty stuff also, though I don't know if it can be said that all chemicals or drugs are gone 100%.
GMO is a catchall term these days - not all of it is bad, and you can't get it all out of the food supply. The food has been broken down inside the birds and will be further broken down by the microorganisms in the compost and then finally in the garden soil.
Good luck with the project. This is probably the best outcome for the droppings from the birds at that plant. That's a good thing.
_________________ Northwesterner
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