Science, of course, is, is 90-plus percent, right, positive, but do you ever worry that science could be wrong and maybe you got it wrong? Or do you feel pretty confident in everything you do?

I don't worry.

The, the problem with this science is false negatives, not false positives.

Once you have those matches and you've built that family tree and you've given law enforcement that lead, that's because you were able to get a good profile.

But the evidence in some cases is treated in a, in a way that we can't get enough of that, those markers, enough of that information to do so, and that's a false negative.

So that doesn't mean that that case can never be solved, it just means we're not getting enough information from that evidence right now.

It's not tractable.

What did you make of that, Kristen?

If you were advising a crew of forensics experts on how and where they should look for DNA at this scene, what would you tell them?

I would definitely look at everything that was, just like Joe said earlier, underneath fingernails, things that had touched the body that may not have been overcome by all the blood and all of the other fluids that were at the crime scene.

Um, because the victim was decapitated that was found, um, in the garage, you have a lot of DNA that belongs to the victim that may overpower any touch DNA or DNA that was found on the towel or the robe or anything that was around that victim to stop the bleeding.

And so those are things I would say try to find DNA that would be a higher mixture of the perpetrator than it would be the victim, just like skin cells under fingernails or something the perpetrator may have touched and not the victim or the victim's fluids.

Now, the other thing is, um, you said earlier that maybe her fingernails wouldn't be useful because they were at the bottom of a lake.

I still think that DNA could be pulled from something like that.

Um, we have identified people that have been chopped to bits and in suitcases at the bottom of a lake for decades, bottom of sewage tanks.

Where was it, and how did you find it?