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As consumers search out a "BPA-free" label as a measure of a product's safety, science continues to indicate that such labels are not an indication that the product is risk-free. In the span of a week, three studies pointed out potential health hazards in various plastics. And without more precautionary testing and laws to safeguard against unknown toxins, experts say it's impossible for a consumer to buy a plastic product that is verifiably safe.