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By Lynette Ndabambi PRETORIA (Reuters) - South African track star Oscar Pistorius had a row with a policeman who picked up his gun after pulling over his friend for speeding, saying "You can't just touch another man's gun," the friend told his murder trial on Tuesday. Pistorius, a double amputee, is accused of murdering girlfriend Reeva Steenkamp on Valentine's Day last year. His friend, Darren Fresco, told the court in Pretoria that he had been driving south of Johannesburg in September 2012 when Pistorius, nicknamed "Bladerunner" for his carbon fiber prosthetics, and his then girlfriend Samantha Taylor were flagged down. "Another officer went over to the passenger seat where Oscar Pistorius was sitting and he picked up a gun.