Digital tools like virtual therapy and meditation apps have made mental health care more accessible. But they’ve made data about the people using them more accessible too. That’s what Joanne Kim found while conducting research as an undergraduate student at Duke University. Kim identified 11 data broker firms willing and able to sell highly sensitive mental health data to her. Marketplace’s Meghan McCarty Carino spoke with Justin Sherman, a senior fellow at Duke’s Sanford School of Public Policy who helped oversee the study, about how this data ends up on the market.