When a New York chemistry professor announced that he had found mercury in canned tuna last December, the Food and Drug Administration began removing thousands of cans from grocery shelves for testing. Most of the tuna was subsequently pronounced safe for human consumption. Not so for swordfish. Last week FDA Chief Charles Edwards warned the public that 95% of all samples of swordfish tested were contaminated with mercury. Only 5% of 853 samples contained mercury below the .5 parts per million safety limit set by the FDA. The average level was twice that. Therefore, said Dr. Edwards, "the FDA has...
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