Every day, the media describe genetic technologies that promise to transform the lives of people with and without disabilities. Prenatal tests are now available for hundreds of conditions, from deafness to dwarfism to hemophilia, and women are encouraged to get tested for the assumed advantage of preventing disability in a future child. Some people with disabilities eagerly await news of stem cell research and clinical trials for gene therapy to mitigate or cure their disabilities. But many people in the disability rights movement are concerned that the increasing use of genetic technologies in this context reflects and reinforces societal assumptions that disability is always harmful and should be prevented, eliminated, or mitigated.