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Roach defending his record.

New information has emerged on the News 8 investigation that is now getting national attention.

ABC's 20/20 last night featured the probe of Dateline NBC's To Catch a Predator sex sting in Murphy.

Collin County's DA defended his record to Channel 8.

There is information you haven't heard - the 23 people caught on that day were not alone. Why have you not heard about the others?

Both Dateline NBC and ABC's 20/20 did stories exploring the ethics of the To Catch a Predator sex sting in Murphy last year.

Dateline criticized Collin County DA John Roach for not prosecuting the cases.

He defended his record.

A teddy bear.

A child's doll.

A kid's playroom.

All in the Collin County courthouse. This is where children tell prosecutors of sexual abuse. DA John Roach says he's prosecuted more than 70 cases this year.

"There are four felony prosecutors assigned to this section, two criminal investigators and two secretaries," he said.

Since NBC Dateline's To Catch a Predator shot its sex sting in Murphy last fall, Roach has been targeted for not taking up cases cited on TV, where in some cases alleged sexual predators admitted their guilt on hidden cameras.

"If you have that and nothing else you really have nothing. You must be able to prove that the person engaged in criminal conduct but what he did do was actually a crime, and what he did do actually occurred," Roach said.

The Murphy police have never turned over critical evidence to the DA, Roach adds.

News 8 has learned Murphy police never followed up on 92 cases of other predators. These men contacted NBC and its paid consultants Perverted Justice on line. But two Murphy police never bothered to track them down.

"That is cherry picking the cases they could put on television. You can't put on television the guys who didn't come to the house. And so they're just going by the wayside. And they're just as much predators as the guys who did show up," Roach said.

Murphy Police say they made 24 arrests but only 23 cases got sent to the Collin County DA. Police Chief Billy Myrick is now trying to get prosecutors in other counties to take some of them. Myrick has not spoken to district attorney Roach for two months.

One person consistently missing form this issue is Murphy Police Chief Billy Myrick. He's never returned News 8's phone calls and his department has fought turning over documents under the Open Records Act.

"Are we having fun yet?" is what Murphy police lieutenant Adana Barber, said after former Kaufman County DA Bill Conradt killed himself during the sting.

A story the City of Murphy fears it will be sued over.

NBC has already been sued for $105 million as a result of the suicide.

But since News 8 began its investigation, Dateline has already changed the approach to its To Catch a Predator shows.

Now NBC contacts the prosecutor before the stings, unlike what it did in Murphy.

Police get the online evidence at the time of arrest and suspects are treated more gently.

To Catch a Predator has been a ratings success.

It's been on the air for more than a year. But after all that happened in Murphy, the network says it has not decided if the show will continue.