This week's E. coli outbreak, preliminarily linked to bagged salads from Dole Food Co., raises questions about whether farms are adequately protecting crops from contamination. A Dole representative says the company's pre-cut, bagged salads go through three washes, including two chlorine baths, but some researchers say that might not be enough to remove all bacteria from contaminated produce. Health experts insist the benefits of consuming convenient, healthy produce outweigh the relatively low risk of becoming ill from contaminated food.

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