I agree that it would be harder for Nifong to go forward without Mangum's testimony in this case. I was only showing you were wrong when you guessed that there had never been a rape case prosecuted when the victim did not testify. In the age of DNA this might be more likely to happen.
I imagine there are a number of cases of raped mentally challenged people that have gone forward on the basis of DNA evidence and not victim testimony. The DNA might often be from the offspring from the rape, but I bet there are a number of such cases.
He doesn't have any DNA matches either.