The "not going to find too many blond-haired, blue eyed white women" comment is unfortunate, not only because this uses a stereotype but also because it seems she doesn't have the data for this.
The 40% vs 86% discrepancy is staggering, but it would be interesting to verify analytically how class plays a role. I would be extremely surprised if a wealthy black person's rape kit were treated differently than a similar white person in this county. And compare that with other poor, mostly white counties across the nation.
They key, I think, here is class, rather than race. NOT that race is not important, but that can't be the 99% of teh story, as implied here. Cornel West makes this point more bluntly in his recent criticism of Ta-Nehisi Coates (https://www.theguardian.com/commentisfree/2017/dec/17/ta-neh...).