DALLAS (October 30, 2009)-A Texas lawmaker has vowed to challenge a 1970s-era Texas law that allows parents to show "harmful material" to their children.

State Sen. Bob Deuell, (R) Greenville, says he's planning to push for a change in the law during the 82nd Texas Legislative Session in 2011.

The senator’s challenge comes after an Amarillo prosecutor said he couldn't charge a man accused of forcing his 8- and 9-year-old daughters to watch hardcore online pornography.

Randall County District Attorney James Farren has asked the Texas attorney general's office to review his decision not to pursue charges in the case.

The law apparently was meant to protect the privacy of parents who wanted to teach children about sex education; but it states clearly that parents can't be prosecuted for showing "harmful material" to their children.

Farren said police reported the incident to his office after one of the girls told a counselor in June that her father made them watch adults having group sex and various other acts at his home in Amarillo.

The parents of the girls, and their 7-year-old sister, are divorced and share custody.