I can not see a trial much less a conviction for someone with a "tainted" reputation doing irreputable deeds when you don't have eyewitnesses, or sperm DNA inside her, or a history of such attacks from any of these young men, etc etc....
IIRC, at first she mentioned three differant players, and the pics of the young men were plastered everywhere so sure, she is going to pick out some likely canidates, funny that at least the two we know about come from the richest families....
In order for Nifong to have "good" DNA results, it would have to be a match with Reade and/or Collin. The die is cast, given the 100% positive ID on Reade and Collin. Picking up a pubic hair or any hair from someone who lives in the house is meaningless. Even a foreign pubic hair combed from Mangum's pubic area won't help Nifong unless it's from Reade or Collin.