| 21. | I merely want to know if it's a dangerous substance.
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| 22. | It is vital that workers should not be directly exposed to these dangerous substances.
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| 23. | Heath officials tested the letter but found no dangerous substances.
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| 24. | Pipelines carry a host of dangerous substances, such as gasoline, propane and natural gas.
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| 25. | He could not have known that inside there was such a dangerous substance as ephedrine.
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| 26. | Prosecutor Giovanni Spinosa contended the cyclists took medicines without knowing that they contained dangerous substances.
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| 27. | EPO is also a dangerous substance to take artificially.
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| 28. | Inside they found a toxic nerve agent and other dangerous substances in his basement lab.
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| 29. | In others, they are ingesting some very dangerous substances.
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| 30. | Distance was required to minimize adverse impacts from noise, dirt, noxious fumes and dangerous substances.
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