What investigators are looking for in Boston
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A section of downtown Boston has become a closed-off crime scene the day after two explosions killed three and injured over 100 at the Boston Marathon.
Forensics expert John Goodpaster, director of the Forensic and Investigative Sciences Program at Indiana University Purdue University, joins The Daily Circuit to talk about the clues investigators are looking for to find out more about who made the explosive devices.
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