HIGHLANDS, Texas -

A teacher has been accused of sexually assaulting two students about 10 years ago, and on Wednesday detectives explained why it took so long to investigate the allegations.

Norman Slaughter, 46, has been charged with two counts of indecency with a child.

According to court documents, Slaughter touched two elementary school students inappropriately and forced them to touch him inappropriately.

The incidents allegedly happened at the Goose Creek Independent School District's Highlands Elementary, 200 E. Wallisville, in 2002 and 2003.

One of the teens said the encounters happened while other students were in physical education class.

"He was like, 'Take a nap … if you wake up and you start feeling good you can go back.' So he let me sit on his chair, and that's when he did it. I didn't know what to do," one of the teens said.

She said she told her mother, father and other relatives, but none of them believed her.

"She made an outcry in 2008 at Highlands Junior High, and I did locate the counselor that took her statement," said Sgt. Tommy Pate of the Harris County Sheriff's Office.

Pate said there was an investigation then, but it was inconclusive because the girl moved and couldn't be found.

"You can't charge a suspect in a child case until a forensic interview is conducted," Pate said.

In a statement to Local 2, a school district representative confirmed "The district first received a report of possible wrongdoing by the teacher in 2008, related to an incident that was alleged to have occurred years earlier."

The girl made two more outcries -- one to a Baytown community service counselor and another Children's Protective Services in 2011.

Last year, another one of Slaughter's students told investigators that he molested her at about the same time.

Slaughter was relieved of his teaching duties and placed on administrative leave in August. School district officials said he did not have any contact with students this year.

Harris County prosecutors told Local 2 that they are searching for other students who may have also been victimized by Slaughter.

Slaughter was released from the Harris County Jail after posting $60,000 bond.