Hoping to uncover clues about family origins and health histories, more than 12 million Americans have sent their DNA to be analyzed. But what actually happens once the sample is in the hands of testing companies? What are they looking at, and how accurate are their results? NOVA explores the value of DNA information and the risks of entrusting our most private data to commercial enterprises.
Watch Secrets in our DNA on NOVA, tonight at 9pm on GBH 2.
