A background check system used by many Texas schools to spot visiting sex offenders is being challenged by two parents.

Yvonne and Larry Meadows say the process violates their privacy and other rights. They're suing the Lake Travis Independent School District over a computer system that checks visitors against a sex offender database. The system scans their driver's licenses, with visitors who don't consent being turned away.

The Meadows parents say the computerized checks violate their constitutional rights, including freedom to associate with their children at school and freedom from unreasonable search and seizure. Neither are listed in the national sex offender database.

Yvonne Meadows said she objected to Bee Cave Elementary School scanning her license because she was concerned about identify theft and a private company collecting her personal information.

The federal lawsuit is believed to be among the first legal challenges to the policy in Texas.

Houston-based Raptor Systems performs background checks for Lake Travis and 5,000 other schools nationwide. Other Raptor clients in Texas include the Dallas school district and Southside school district in San Antonio.