What is an alibi defense, and does Dzhokhar Tsarnaev have one in regards to the charges for which he was convicted? Attorney Tom Frizzell returns to break down trial transcripts and help Heather determine whether Dzhokhar was involved with gathering the bomb-making materials that were used in the Boston Marathon bombing. Despite what was reported in the media, the information on the record is far more exculpatory than one might expect. 

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