It makes no sense to presume that the thousands of untested organochlorines are benign, given that virtually every chlorinated compound ever tested causes one or more toxic effects. Chlorination almost always increases the toxicity and the bioaccumulation of organic chemicals. It is therefore logical and consistent with existing knowledge to presume that all chlorinated compounds are hazardous unless specific information suggests otherwise. The last reason for treating organochlorines as a class is ethical. This places the burden of proof on the public to prove that each chemical is harmful.
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