Tex. Transportation Code § 547.616: RADAR INTERFERENCE DEVICES; OFFENSE.

(a) In this section, "radar interference device" means a device, a mechanism, an instrument, or equipment that is designed, manufactured, used, or intended to be used to interfere with, scramble, disrupt, or otherwise cause to malfunction a radar or laser device used to measure the speed of a motor vehicle by a law enforcement agency of this state or a political subdivision of this state, including a "radar jamming device," "jammer," "scrambler," or "diffuser." The term does not include a ham radio, band radio, or similar electronic device.

(b) A person, other than a law enforcement officer in the discharge of the officer's official duties, may not use, attempt to use, install, operate, or attempt to operate a radar interference device in a motor vehicle operated by the person.

(c) A person may not purchase, sell, or offer for sale a radar interference device to be used in a manner described by Subsection (b).

(d) A person who violates this section commits an offense. An offense under this subsection is a Class C misdemeanor.

Added by Acts 2011, 82nd Leg., R.S., Ch. 739 (H.B. 1116), Sec. 1, eff. September 1, 2011.