More likely Nifong had her hauled in and confronted with her lies about not having consensual sex with anyone within five days prior to the alleged incident, and threatened her with prosecution for obstruction and possible other charges if she didn't fess up.
The drivers would probably not admit to having sex with her unless she named them. Further, the defense apparently didn't know about the unidentified semen sample in her at the time they announced there was no DNA match to their clients.
It's weird. After that first test, there was no hint of another man's DNA being found. I recall lawyers saying that there was no DNA found at all, in fact.
This is puzzling. How could the SBI miss the boyfriend's DNA, and if they didn't miss it, why wasn't that in the report given to the defense?
If the first report found the DNA of the boyfriend, why bother with the second round of tests? Unless Nifong just couldn't believe the results.