But every day, too, we get one or two we can't find anywhere — truly missing people, whose absence has only now been discovered.

We've found quite a few people who didn't want to be found.

This is such a very different type of DNA testing than people know about. It's very different from forensic DNA analysis, where you are trying to match a sample to a specific crime suspect. This is kinship, and you will never get an exact match between a mother and a son. You get what's known as a probability of a relationship.

People think responsibility is hard to bear. It's not. I think that sometimes it is the absence of responsibility that is harder to bear. You have a great feeling of impotence.

We tracked one parolee to New York, but when we got him on the phone he threatened to kill the person who found him.

We didn't have any type of filters on these calls. We got a lot of bad data.