I took a cannabis DNA test and learned more than I bargained for

"Jen King, Director of Consumer Privacy at Stanford University’s Center for Internet and Society, calls these companies her “worst nightmare.”

“A lot of the data we share online is expirable, in some sense,” she says. “Your shopping habits or your basic demographic data change over time. Your DNA never changes. It literally has an infinite shelf life — and it’s uniquely identifiable in a way that no other personal data is.”"