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So long as the lead is in a compound which can't be processed by the human metabolism, then there's no problem. I work in XRay, and we work with compounds in the human body all the time which the body can't metabolise, so there's (usually) no harm from them. Lead Chromate is easily metabolised, though (the compound cited in the article). I find it interesting that 10 polyethylene fields were tested and found no lead at all, while both of the nylon fields tested had lead. Could simply be how well those plastics hold their color. I'm interested to find out what the fields at Belfry, SVHS, Pikeville, and others, are made of...

Polyethylene at Belfry.