Despite remarkable progress, much remains unknown about the risks and benefits of genetic testing. No effective interventions are yet available to improve the outcome of most inherited diseases; negative test results might not rule out future occurrence of disease, and positive test results do not necessarily mean the disease will inevitably develop. In view of this uncertainty, the Working Group on Ethical, Legal, and Social Implications of Human Genome Research at the National Institutes of Health and Department of Energy created the Task Force on Genetic Testing. Comprising...