The Murphy City Council met in an executive session with the chief of police, Chief Billy Myrick, in an attempt to find out more about what happened in the sex stings that took place last fall.

It's been nine months since the sting, but many questions have remained unanswered.

One of the biggest issues people have become concerned about is why was the chief of police working with Perverted Justice and NBC when he was advised against such an involvement by the Collin County district attorney.

News 8 learned many law enforcement officials, including those from Dallas County, have declined to work with groups like Perverted Justice.

The biggest NBC sting took place 18 months ago in Riverside California. With the group Perverted Justice calling the shots, the Riverside County Sheriff's Department arrested 52 men who came to a house after having internet chats with people they believed were underage boys and girls.

"We were approached by Perverted Justice to do this large sting, and they told us that Dateline would be following along," said Lt. Chad Bianco, Riverside Sheriff's Department.

So far, 19 of the 52 have been found guilty and 32 cases are still pending.

At the 19th Annual Crimes Against Children Conference in Dallas last week, law enforcement officials have a rule in stings, "If you're not a cop, you're not welcome."

"The national police of Internet Crimes Against Children Task Force is not to work with any private agency on an investigation," said Ches Williams, Dallas Police Department.

In the Murphy stings, conducted with Perverted Justice and NBC's "To Catch a Predator," 23 were arrested, but no case has been accepted by the Collin County district attorney.

"If this had been done according to the law, they would be prosecuted and they would be convicted," said Lawrence Braunstein, former prosecutor. "Now we've got nothing."

Forty-six major police departments nationwide now have Internet task forces to catch predators and other Internet criminals. While the groups are open to tips, the predominant rule is that they will do the investigations themselves.