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A CBS News investigation examines HMOs' failures to monitor doctors carefully and reveals that some "health plans will even allow doctors with known problems to stay in their networks," although they can easily get information about problem doctors from the National Practitioner Data Bank. The investigation also finds that "many plans use outside, third party companies to re-credential their doctors every 2 years, or whenever state law requires," but "some of these organizations do the minimum number of checks..." The story shows that, as a result, "if issues arise in between credentialing periods, they may never be noted by the HMO."