Widespread toy recalls last year have made many parents particularly vigilant about ensuring their kids are not exposed to items that contain toxic substances, including mercury and heavy metals. Although Congress passed a law to ban most dangerous substances, many of its measures don’t take effect until next year.

Nearly one-third of the popular toys tested contain medium to high levels of lead, cadmium, mercury or other potentially dangerous chemicals, according to the Michigan-based Ecology Center.  Toy jewelry figures prominently on the “Worst Toys List.”

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