'They have a future'

These are images of Donald Bakker's child victims. Canadian authorities wanted to prosecute Bakker for those overseas sex crimes, but they didn't know who the victims were or where the crimes took place -- until Bieg tuned in to our report on Cambodia. He couldn't believe his eyes when he began to look closely at the video.

Ron Bieg: We see rooms that look eerily similar to the rooms in Bakker's videotape.

Chris Hansen: Some of the children looked to be--

Ron Bieg: Similar.

Chris Hansen: Similar. That's a pretty good break.

Ron Bieg: It was a godsend.

Bieg explained to us how he compared images from our broadcast with Bakker's tapes.

Chris Hansen: So you were able to match, for instance, this piece of furniture here to a piece seen in the tape confiscated from Bakker.

Ron Bieg: Exactly.

And an even closer look at our tapes reveals other details that matched: this window, these posters on the wall...

Chris Hansen: It turns out that some of the girls seen on Bakker's video performing sex acts on him were seen being rescued in our story.

Ron Bieg: Yes. Four of them. That was the break that we needed.

Donald Bakker pleaded guilty to sexually assaulting seven girls in Cambodia and three adult prostitutes in Vancouver.

He was sentenced to seven years in prison.

And he was not the only individual to face justice after our original story.

Possibly because of all the attention, Cambodia has begun to crack down on foreign sex offenders.

Investigator: Hey, Terry.

Like Terry Smith.

Last year he was running a bar in a beachfront town in southern Cambodia.

Bob Mosier of the International Justice Mission said his group heard that Smith was selling young girls for sex and was allegedly also raping them himself.

Bob Mosier: He would show these children pornographic videos. And when, after watching the videos, he would have these children perform these sexual acts on him. As training.

Mosier sent in undercover investigators as customers.

Smith apparently told the girls to dance for the customers, first with their clothes on and then, shockingly, with their tops off.

The human rights group took the evidence to the Cambodian authorities.

This police officer arrested Smith and his girlfriend and says he found tapes Smith made of himself in several Asian countries.

Cambodian police official [translation]: I believe that he didn't violate only these girls here. I believe he violated many other girls.

It also turned out that Smith was a convicted sex offender in the United States and was wanted in Oregon.

The Cambodians agreed to turn him over to U.S. authorities.

Last October, U.S. Marshals escorted Terry Smith home to the U.S. to finally face those charges back in Oregon.

Last month, Smith was sentenced to 22 years in prison.

Since we first started reporting on this issue four years ago, the changes in Cambodia, in many ways prompted by human rights advocates like Gary Haugen, have been profound.

Gary Haugen: The difference is dramatic. And it should be a sign of hope for other countries that struggle with the problem of sex trafficking.

He's especially proud of what's happened with some of the girls his group has helped rescue.

Gary Haugen: Just a few weeks ago I was able to see for the first time some of those youngest girls that we rescued and they talked to me about how one wanted to become a lawyer. And one wanted to become a translator. And one wanted to go into computers. And this is a transformation that one can appreciate only if you've ever seen the undercover video of what was being done to these children inside these brothels. They have a future.

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