16 Tex. Admin. Code § 3.73
Vehicles assigned to and used by district office field personnel are exempt from bearing the inscription required in Texas Civil Statutes, Article 6701m-1. These vehicles are used in regulatory and administrative activity, including inspections and investigations which require that the Railroad Commission of Texas personnel be able to accomplish their tasks undetected.
Source Note:The provisions of this §3.73 adopted to be effective September 27, 1983, 8 TexReg 3928.