This paper seems balanced:
http://74.125.155.132/scholar?q=cache:1MrI0c6oxtkJ:scholar.google.com/+organic+manure+%22food+poisoning%22&hl=en&as_sdt=80000000&as_ylo=2005&as_yhi=2010
Rememeber that organic agriculture was a main cause of the dust bowl of the 1930s.
It is dangerous to live in a free society where we make individual choices. I prefer to live with these dangers rather than have the government protect me.
If you have a lawn (spayed or not), you are maintaining a wildlife desert. We have chosen to develop 90% of our farm as wildlife habitat, which we can do by practicing high-intensity farming practices on 10% of the land. This seems preferable to me compared with disrupting all the land with low-intensity farming practices. The animals agree based on their numbers and diversity. They spend little time on my unsprayed lawn.
The dust bowl was caused mainly by inorganic or improper farming techniques. Raping the natural lands, tearing out the native grasses and destroying the fragile topsoil that took ten of thousands of years to make. To say the dust bowl was caused by organic agriculture is patently false. It was caused by farmers destroying native habitat to make a buck.
Let me know when the government protects you. Our free society has been totally usurped by big corporations and thier neverending appetite to make more bucks. The government did not protect us, it protected them, bought and paid for by the campaign contributions and lobbyists. I could debate this forever and a day with you, but your brainwashing is so thorough I have lost all hope at your redemption. I have spent my entire life watching everything around me evaporate, the value of the dollar, my quality of life, the environment. I care, you don't. I get it. Some people are pawns, other knights.
I am going to test out some Avenger Weed Killer. Some say it outperforms gly side by side. I know some organic gardners that swear by it, and still reamin certified using it.