27 C.F.R. § 70.23
(b) Persons who may serve summonses. Any appropriate TTB officer may serve a summons issued under 26 U.S.C. 7602.
(68A Stat. 902, as amended (26 U.S.C. 7603); 26 U.S.C. 7805 (68A Stat. 917), 27 U.S.C. 205 (49 Stat. 981 as amended), 18 U.S.C. 926 (82 Stat. 959), and sec. 38, Arms Export Control Act (22 U.S.C. 2778, 90 Stat. 744), 27 U.S.C. 205, 22 U.S.C. 2778, 26 U.S.C. 7602, and 5 U.S.C. 301)
[T.D. ATF-6, 38 FR 32445, Nov. 26, 1973, as amended by T.D. ATF-48, 43 FR 13531, Mar. 31, 1978; T.D. ATF-201, 50 FR 12533, Mar. 29, 1985; T.D. ATF-249, 52 FR 5961, Feb. 27, 1987; T.D. ATF-301, 55 FR 47608, Nov. 14, 1990; T.D. ATF-450, 66 FR 29023, May 29, 2001]