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For the full story, use this URL. http://abcnews.go.com/sections/living/DailyNews/perchlorate_humanstudy001129.html By Tom Verdin The Associated Press L O M A L I N D A, Nov. 29 — Doctors doing a study of a toxic water pollutant defended feeding it to human participants, saying the potential medical benefit outweighed the risk. The Loma Linda University Medical Center researchers held a news conference Tuesday to respond to media reports raising concerns about people being given doses of perchlorate, a chemical used in rocket fuel that has contaminated ground water in parts of Southern California.