DALLAS (AP) — Advocates say the child-protection system in Texas should be revamped to better monitor adoptions and prevent a re-occurrence of the seven special-needs children found near Houston isolated and living in filthy conditions.

Ruthanne Mefford, chief executive of Child Advocates of Fort Bend, says a statewide program may be needed to ensure children's safety even after an adoption is formalized.

The teenagers discovered in the home were adopted in 2003 and 2004. State officials say a caseworker doesn't conduct a welfare check after an adoption is completed unless there's a complaint.

The adoptive mother of the teens and a man documents show is her husband have been charged.

Authorities have acknowledged the troubled, understaffed Child Protective Services' agency is in need of a broader overhaul.