What happened to the COVID app? 'They did a lot of things right... but there are questions I can't figure out.'

Since the early days of this pandemic, health officials have said that one of the keys of containing this virus would be contact tracing. If you test positive, someone calls you and asks who you've been around. Then they reach out to those people and ask them to quarantine and get tested. And for the people you've been around who you don't know -- there's an app for that. Pennsylvania's app has been out for about six months, but if you didn't know that, you're not alone. About 93% of the state hasn't downloaded it. Dr. Jason Thatcher is the Milton F. Stauffer Professor at Temple University, he joins KYW Newsradio In Depth to talk about the app, why it seems like no one wants to use it, and how officials could have done it differently to get more people to buy in.