There are also some controversial downsides to genetic testing. The value of genetic testing is particularly questionable when testing for a disease that is untreatable. For exanple, Alzheimer's disease runs in An Lee's family. An has decided to get genetic testing to see if she is likely to develop it. Her husband Bao is not happy about her choice. Bao explains if the result is positive, how will it help to know that she will probably develop the disease?" if I had the Alzheimer's gene, I wouldn't want to know" Another issue is that even if someone tests positively for a disease, it doesn't mean that they will definitely develop the disease. So a person could spend years worrying about something that never ends up happening.