Tex. Loc. Gov't Code § 351.101

The commissioners court of a county, with the approval of the sheriff of the county, may contract with a private organization to place inmates in a detention facility operated by the organization. The commissioners court may not contract with a private organization in which a member of the court or an elected or appointed peace officer who serves in the county has a financial interest or in which an employee or commissioner of the Commission on Jail Standards has a financial interest. A contract made in violation of this section is void.