If they really had the wrong guys, then these guys would have an explanation for how their DNA got in her car. But they deny ever being near her, rather than say that she gave them a ride once....
I've thought about that. It's pretty clear they are lying about being in her car. Some people have proposed they went in their to steal stuff and that's why they were lying. I know that would be stupid of them, but have you seen these guys?
It's the fact that there is no DNA on the murder implements or under her fingernails that bothers me. I suppose it is possible that there is a third culprit (as another poster suggested)and they were accomplices.
I hope you are right and I am wrong. I really want to believe that Cassada and Carver are the right guys. I knew Ira and I want justice for her.
Which is precisely why one should never, ever talk to cops. That goes double if one is actually innocent.