Maybe I was unclear. The car did have a seal on the doors. There are LEO cars in the area that do not have any external markings, just lights hidden in the grill. Some of them don't even use the 'exempt' plates most police cars do. I think it is very dangerous for police to make traffic stops in vehicles that are not clearly marked.
Reading Tx law posted above, the Law Enf agencies in a county or city must comply with 721.005 and specifically get permission from the "Governing body of a municipality" in order to be exempted from posting "in letters plainly legible at a distance of not less than 100 feet" ... " on each side of the vehicle".
IOW - Law Enf must submit a request to their city or county "Governing body of a municipality" in order to be exempted from this state requirement of posting clearly who they are:
§ 721.005. Exemption From Inscription Requirement for Certain Municipal and County-Owned Motor VehiclesI know of a county in East Tx where the Sherriff got into a pissing contest with the commissioners - and the commissioners in turn 'leaned' on the Sherriff invoking various state statutes that give them governance over those Law Enf people under their control ...Subsection (a) as amended by Acts 2001, 77th Leg., ch. 66, § 1
(a) The governing body of a municipality may exempt from the requirements of Section 721.004 an automobile when used to perform an official duty by a:
(1) police department;