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It’s now over a dozen years since the mapping of the human genome was completed, and the pace of discovery holds great promise to revolutionize our understanding of disease formation. This revolution has also led to a tsunami of DNA data created by genetic testing, research and the commercialization of such research. As more and more of this personal information becomes public knowledge, it can be bought and sold by any commercial interests interested in predictive information about an individual's future health status.

There's a seductive appeal to thinking that because we understand some things about the genome, we now understand a lot about its role in health and disease. The reality, however, is that we don't have a very good grasp of precisely how to relate your genetic information to your health and it remains, in most cases, a poor predictor of future health status.

For these very reasons, the Genetic Information Nondiscrimination Act was enacted to provide strong protections against access to and misuse of genetic information in employment and health insurance. It’s a strong and successful first...