The samples were obtained from 46 of the team's 47 players. The 47th is black.
Racial tensions have been building on campus and in the surrounding community as the investigation continues.
CBS News Correspondent Trish Regan reports Durham County, N.C. District Attorney Mike Nifong has aid he could file charges as son as this week, if charges are filed at all.
Protesters gathered outside the now-vacant lacrosse players' house Sunday to show their support for the dancer.
"Part of the problem," observes Duke Law Professor James Coleman, "is that everybody wants immediate responses, immediate answers, and I just don't think that's how the real world works."
Coleman told Regan the case has become too public, too soon: "If you look at what's happening from a criminal investigation, for example, you have a prosecutor that's been out there, basically, developing his case in the media."
And it's not just the prosecutor, Regan points out.
Now, the defense attorneys are playing offense, as well.
One, Bill Thomas, says he has of the dancer arriving at the house that show she was already bruised on her face and legs, before the alleged rape is said to have occurred.