After 9/11, the U.S. spent billions of dollars establishing the Transportation Security Administration. After more than 20 years of pat-downs, barefoot X-rays, and so-called random screenings, evidence shows that the TSA has played almost no role in foiling terrorist plots. Journalist Darryl Campbell recently wrote for The Verge about the agency’s history. He spoke with Apple News In Conversation host Shumita Basu about the state of airport security today and what a better system could look like.