"Instead of using composted animal manure, they spray fresh human manure in large concentrations on to the crops."
"I find that hard to believe. Even hippies aren't that stupid."
Farmers can get really good deals on fresh fertilizer from local waste treatment plants. If you just spray your lettuce with some "ASAP Solution", a patented colloidal silver solution, after washing it off then it will kill 99.99% of the germs that may be left.
Not even colloidal silver will kill germs it can not touch when the germs are in the plant tissues.