2016 Boston Marathon, Mile 18: Before and After

Special | 2m 59s

After the bombs went off near the finish line in 2013, the marathon changed. We talk with national security expert and Bostonian Juliette Kayyem about the security challenges involved in organizing a 26 mile race through a major city.

Aired: 03/28/16

Rating: NR

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WGBH is a local public television program presented by GBH.