Say what? ALL Evidence? Think about that, Dusty, I have fought wildfires and there is always something left of a critter, even a gut pile would likely survive a grass fire (roasted, shriveled, but still there). No bones, no hide, no head, no skull, nothing? Not likely. Scavengers might do the clean up, but the fire alone would not likely eliminate all evidence, unless all there was was a blood trail.
I suspect they’re talking about all evidence of human involvement. Besides I’m not going to retry them, they’ve already been tried and found guilty. Witness testimony including a family member said the fire was intentionally set to cover the crime.