Pistorius' defense grills investigator

Oscar Pistorius reacts during his trial at the high court in Pretoria, South Africa, on March 13, 2014.
Oscar Pistorius reacts during his trial at the high court in Pretoria, South Africa, on March 13, 2014.

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    Pistorius' defense grills investigator

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An investigator on the Oscar Pistorius case said in court that his unit mishandled evidence. CNN's Robyn Curnow reports.