Maybe Nifong sent it to the private lab rather than the SBI lab because he wanted to give the impression that there was something important there that needed finer testing, thus implying that there was a "there" there and the matter was not over even though the DNA on the players was negative. There were no indictments at that time, so Nifong had no real obligation to notify the defense that there was unidentified semen found in her.
Obviously, the state lab got a semen specimen from the vaginal swab and could not match it to any of the samples from the team, which apparently was a surprise to Nifong, so he hauled her in, gave her hell and got the names.
The N & O had one teeny little article today. I guess they're already obeying the "gag order" on their own, lol...