1 Tex. Admin. Code § 81.46
The authority responsible for distributing election supplies for an election shall arrange for the delivery of voting systems equipment to the polling places. Delivery of such equipment must be made by such authority, by the presiding judge of the polling place, by the sheriff or constable for an election ordered by the governor or a county authority, or by the sheriff or constable or a police officer having jurisdiction over the territory in which the polling place is located for an election ordered by other authority. Mechanical voting machines must be delivered in a locked and secured condition. The keys to such voting machines shall be delivered to the presiding judge at least 30 minutes before the polls open, in a sealed envelope on which there is recorded the number on the protective counter, the seal number, and the serial number of the voting machine the key is for.
1 Tex. Admin. Code § 81.46