It isn't 0 percent, nor 2 percent, but neither is it 20 percent. The best estimate is 8-10 percent but even that is on shaky ground.
Why it's so hard to quantify false rape charges. - By Emily Bazelon and Rachael Larimore - Slate Magazine
But isn't the rate of false rape charges an empirical question, with a specific answer that isn't vulnerable to ideological twisting? Yes and no. There has been a burst of research on this subject. Some of it is careful, but much of it is questionable. While most of the good studies converge at a rate of about 8 percent to 10 percent for false rape charges, the literature isn't quite definitive enough to stamp out the far higher estimates. And even if we go by the lower numbers, there's the question of interpretation. If one in 10 charges of rape is made up, is that a dangerously high rate or an acceptably low one? To put this in perspective, if we use the Bureau of Justice Statistics that show about 200,000 rapes in 2008, we could be looking at as many as 20,000 false accusations.
I graduated from Antioch College at the height of the Sexual Offense Policy implementation, but missed the nationwide scorn and derision heaped upon my alma mater. I'm still of a mind that false rape accusations are fairly rare, but also that one is too many.
I'm also still very much in favor of private institutions being able to remove those suspected of sexual battery at their discretion.