Nina Pullano
More from Nina Pullano
![contact tracing app](https://www.popsci.com/wp-content/uploads/2020/10/02/POCEDJU4PZGH3DD4RGQLSJ7LCA.jpg?w=675)
COVID-19
How does contact tracing work, and how extensive will it be for Trump? How does contact tracing work, and how extensive will it be for Trump?
By Nina Pullano
October 2, 2020
By Nina Pullano
October 2, 2020