Let me go back to the couple, the digital couple.

So think about all the people you meet and the hundreds of random numbers.

And they were even identified as girl I ran with, second girl I ran with, a contact in, and parentheses hair.

But then there was mother and father and his sister and just a few others.

18.

And he's, you know, he's in his 30s.

That's unbelievable at this, in this day and age, it is not unusual for people to have

well over a thousand contacts, many thousands of contacts at this stage in our lives.

Everything is on our phones. Everything's digital. What about text chains? Did you see any

communications with other people other than mother and father?

Not really. No, it was, I couldn't name a single person that he communicated with other than just his parents.

There was some one-off communications here and there, and there were some emailing and other things.

But for texting, if you think of the friend that you send a message to on a limb, there wasn't one single person like that.

And I know that we learned during the final hearings before he was sent packing to the Idaho maximum security institution,

that he had done quite a job at scrubbing a lot of his devices.

How good a job and how were you able to get past some of what he thought he put over on you?

This was one of the hardest investigations I've ever worked in 23 years of looking at digital data.

He cleaned up well. He knew how to use VPNs. He knew how to use incognito browsing. Where he messed up,

downloads on his Android device. He also didn't consider the fact that even on a PC, if you delete,

every contact leaves a trace. So we can see the files when you turn something off. We can see when you clear something.

All of that was left behind for us.

Let me ask you this. The handshakes that we now find are so helpful in digital forensics when killers don't realize they're connecting to a Wi-Fi where they're not

...