Is Crumb Rubber Safe?

what is there to know?

Some scientist have studied and studied over whether or not the black crumb on the football field is safe or not? in the article " is crumb rubber really safe, some ask" says that the rubber doesn't contain any toxic waste. Benzene and carbon tetrachloride where the only two that were detected. The say that there was only the tiniest amount.
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It is spreading.

Now not only is it in the football fields that tare making the surface of the kids playgrounds out of the crumb rubber. How are we gonna fix this?