Would you use them?? I know what they are, The industry says there safe, But are they.My brother used to work in A plant that processed them. I think it can best be used to make sod. for the Gold courses. And the turf industry. But to grow food. I Am unsure about that,I would worry about the heavy metals myself. And then theres the Biological vectors. In The state of Miss. they pay you to let them apply it to your fields. Would you let them???