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Federal and state watchdogs opened a new front Monday in the campaign to keep poisons out of Chinese imports, launching inquiries into high levels of cadmium in children's jewelry while Walmart pulled many suspect items from its store shelves.

A day after The Associated Press documented the contamination in an investigative report, the top U.S. consumer safety regulator warned Asian manufacturers not to substitute other toxins for lead in children's charm bracelets and pendants.

Regulators and lawmakers reacted swiftly to the AP report, which found that some Chinese manufacturers have been using cadmium, sometimes at extraordinarily high levels. Congress …