Millions Could Be Identified Using Genetic Databases—Even if They Never Took a DNA Test

Up to 60% of Americans of European descent could be identified using only a DNA sample, some basic personal information and consumer genetic databases—even if they've never done a genetic test themselves, according to a new study published in Science.

Some 7 million Americans have taken a direct-to-consumer DNA test, many of which promise insights about ancestry, wellness and likelihood of developing certain chronic diseases in exchange for a sample of spit.