The State exercises special control over the use of high toxic substances in workplaces.

国家对作业场所使用高毒物品实行特殊管理。

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Article 28 the employing units shall, according to the provisions, shift posts for the workers engaging in the operations in which high toxic substances are used.

第二十八条用人单位应当按照规定对从事使用高毒物品作业的劳动者进行岗位轮换。

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Article 3 toxic substances are classified into general toxic substances and high toxic substances in light of the extent of occupational poisoning hazards caused by toxic substances.

第三条按照有毒物品产生的职业中毒危害程度，有毒物品分为一般有毒物品和高毒物品。

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Others say it's high in toxic substances -- mercury, dioxins and PCBs -- and should be avoided.

CNN: Seafood benefits outweigh risks, government says