Tex. Code Crim. Proc. art. 18B.151
(b) A peace officer authorized to possess, install, operate, or monitor a device under Subchapter E, Chapter 18A, may install and use a pen register or trap and trace device if the peace officer reasonably believes:
(1) an immediate life-threatening situation exists that:
Added by Acts 2017, 85th Leg., R.S., Ch. 1058 (H.B. 2931), Sec. 1.02, eff. January 1, 2019.
Acts 2021, 87th Leg., R.S., Ch. 488 (H.B. 3363), Sec. 6, eff. September 1, 2021.
Acts 2021, 87th Leg., R.S., Ch. 536 (S.B. 112), Sec. 7, eff. September 1, 2021.