George Zimmerman's second degree murder trial enters second week

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George Zimmerman Trial Detective Chris Serino Police lnterview

SANFORD, Fla. -- Testimony in the second week of the George Zimmerman trial begins Monday with an expected shift by prosecutors toward witnesses that will testify on the scientific evidence they have against a former neighbor watch leader charged in the fatal shooting of Trayvon Martin.

Prosecutors have yet to call forensics experts or investigators that performed testing on the handgun Zimmerman used to shoot the teenager during an altercation between the two last year.