Saddam Hussein objected on Tuesday to allowing a leading American forensic scientist to testify about his investigation into a mass grave of Kurds in the genocide trial of the former Iraqi leader. Clyde Snow - an expert from the University of Oklahoma - took the stand and began to give background on his work, but defense lawyers quickly argued that experts should be brought in to verify Snow's credentials. Saddam insisted that Snow should not be allowed to testify because he was American and demanded neutral international experts, suggesting that the bodies in the grave may have been moved to the location from separate locations. "No one should imagine I'm trying to defend Saddam Hussein, given the earlier sentence against me. You can only be executed once, not 10 times," Saddam said, referring to the death sentence issued against him on Nov. 5 in an earlier trial on charges of killing Shi'ites. "I'm only trying to defend the truth."