Yeah, round-up is my neighbor's go-to chemical as well! That and Sevin dust! He then gives me produce from his garden that I really appreciate, except I know he just dusted with Sevin a few days ago!
The field behind our house belongs to this same neighbor and he rents it out to a nearby farmer. Every year this farmer plants round-up ready soybeans. In my back yard! I just have to hope my chickens aren't interested!
Oh I forgot, the neighbor also uses chemical fertilizer and once a year applies manure/dead chickens from the chicken torture warehouses down the road. It reeks for DAYS and is so depressing to see skeletal remains of chickens in a field of GMO soybeans being sprayed with all manner of chemicals right behind my house.
I'm glad you guys mentioned grass clippings for nesting material! With all the rain, the grass has grown faster than they can eat it so I had to mow it for the first time this year. I raked as many piles of grass as I could this morning and put it in the nest box and run.