D.C. Mun. Regs. tit. 18, § 754
754.1 Approved testing procedures used to perform the federal transient emissions test shall meet the performance standards established in 40 CFR 51.357 and Appendix E of 40 CFR or a U.S. Environmental Protection Agency approved equivalent.
754.2 Prior to performing the federal transient emissions test, the motor vehicle shall be inspected in accordance with chapters 6 and 7 of this title to determine that the vehicle can safely undergo the federal transient emissions test.
754.3 A vehicle failing the inspection required by § 754.2 shall be rejected, and no federal transient emissions test shall be performed until the vehicle passes reinspection.
754.4 Detailed procedures used to perform the federal transient emissions test shall be included in the current edition of the Lane Operator's Inspection Manual, or when applicable, the current edition of the AAMVA Manual
SOURCE: Final Rulemaking published at 41 DCR 4941, 4938 (July 22, 1994); as amended by Fiscal Year 2010 Budget Support Act 2009, effective March 3, 2010 (D.C. Law 18-111), at 57 DCR 181, 291 (January 8, 2010).