![KPBS Evening Edition | KPBS.org show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/045/749/small/kpbs-evening-edition-kpbs-org.jpg)
Summary: Stratfor Tactical Analyst Paul Floyd discusses how investigators will use evidence to identify who was behind the April 15 Boston Marathon attack.
Summary: Stratfor Tactical Analyst Paul Floyd discusses how investigators will use evidence to identify who was behind the April 15 Boston Marathon attack.