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Defense calls medical expert in George Zimmerman trial

14:21

On the 21st day of the George Zimmerman trial, the defense called a medical expert to testify about the moment the shot killing Trayvon Martin was fired. MSNBC’s Craig Melvin, legal analyst Lisa Bloom, former Florida Circuit Court Judge Alex Ferrer, and veteran prosecutor Paul Henderson join Hardball to discuss how important today’s testimony was in establishing reasonable doubt.