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Trayvon Martin Update: Judge blocks Zimmerman's defense from discussing Martin's alleged fighting, marijuana use

George Zimmerman (center) and his attorney Mark Mara arrive in court on April 30, 2013. AP Photo/Orlando Sentinel, Pool, Joe Burbank

(CBS/AP) SANFORD, Fla. -- A Florida judge ruled Tuesday that the defense at George Zimmerman's murder trial may not bring up Trayvon Martin's past marijuana use, school suspensions or fighting without clearing a number of additional legal hurdles and a subsequent ruling granting them permission, the Orlando Sentinel reports.

PICTURES: George Zimmerman faces murder charge

The ruling comes during a pre-trial hearing two weeks ahead of Zimmerman's murder trial. He is charged with fatally shooting the unarmed 17-year-old Martin last year during a confrontation at a gated community in Sanford.

The text messages about Martin's smoking marijuana and trouble at school were released by attorneys for Zimmerman last week, and are among several subjects being considered at Tuesday's pre-trial hearing in Sanford, Fla. The photos released by the defense team also show Martin blowing smoke and making an obscene gesture toward a camera.

The judge also will consider whether a voice analysis expert can be called by prosecutors to determine who was making cries for help on 911 calls, and a defense request for a trial delay.

Complete coverage of the Trayvon Martin Case on Crimesider  

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