State attorney John Guy said in his opening statement that Zimmerman thought Martin was one of the "punks" who "always get away" whom he had observed previously in his neighborhood and reported the activity to police.

Defense attorneys objected to the introduction of the calls, saying they were being used in violation of evidence rules to show prior bad acts.

Zimmerman is charged with second-degree murder in the death of Martin, who was 17 years old. Zimmerman has pleaded not guilty, claiming self-defense

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