We note that on cross-examination the officer denied that he had ever shared a bed with the witness. See note 5, supra. Presumably the witness, if permitted to testify, would have contradicted that statement, but this circumstance did not qualify the disputed testimony for admission. As we have had occasion to state, “generally the inquiring party is concluded by the witness’ answer when cross-examination relates to a matter collateral to the issues, and he may not later rebut it for purposes of impeachment.” Ewing v. United States, 77 U.S.App.D.C. 14, 21,
135 F.2d 633, 640, cert. denied 318 U.S. 776, 63 S.Ct. 829, 87 L.Ed. 1145 (1941). See also Lee v. United States, 125 U.S.App.D.C. 126, 129, 368 F.2d 834, 837 (1966); 3 J. Wigmore, Evidence §§ 1000-1003 (3d ed. 1940). And the term “collateral,” we said, “can mean no more than the matter inquired about is not logically relevant, independently of ‘pure’ impeachment, to the issues or cause on trial or is so only in so remote and indirect a manner that the authoritative tribunal thinks it should not be inquired into in a case of contradiction by extrinsic testimony or, in one of self-contradiction, further than to make inquiry of the witness.” Ewing v. United States,
supra, 77 U.S.App.D.C. at 21,
135 F.2d at 640. We have no difficulty in concluding that the answer appellant elicited from the officer was of that character, precluding appellant from attempting contradiction by extrinsic testimony.