Prosecutors say Dr. Trent Pierce is expected to testify Tuesday afternoon or sometime Wednesday. Pierce was nearly killed when a homemade bomb exploded in his driveway in February 2009 and has not spoken publicly about the blast.
Mann is accused of planning the attack in retaliation against the medical board. The board was investigating whether to revoke Mann's medical license at the time of the bombing.
Mann's trial began July 6, and his attorneys say he's innocent. No forensic evidence links Mann to the bomb found outside Pierce's home.
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