There are special conditions in Rule 609(d) for admission of 'juvenile adjudications'. See United States v. Ashley, 569 F.2d 975, 978 (5th Cir.), cert. denied, 439 U.S. 853, 58 L. Ed. 2d 159, 99 S. Ct. 163 (1978); United States v. Canniff, 521 F.2d 565, 569 n.2 (2d Cir. 1975) (dictum), cert. denied, 423 U.S. 1059, 96 S. Ct. 796, 46 L. Ed. 2d 650 (1976); cf. United States v. Edmonds, 173 U.S. App. D.C. 241, 524 F.2d 62 (D.C. Cir. 1975) (same rule under D.C. Code § 14-305); Luck v. United States, 121 U.S. App. D.C. 151, 348 F.2d 763, 767 (D.C. Cir. 1965) (same rule prior to enactment of Rule 609). See generally United States v. Bland, 153 U.S. App. D.C. 254, 472 F.2d 1329 (D.C. Cir. 1972) (no constitutional bar to trying persons under 18 as adults for certain serious crimes), cert. denied, 412 U.S. 909, 36 L. Ed. 2d 975, 93 S. Ct. 2294 (1973). But see United States v. Harvey, 588 F.2d 1201, 1203 (8th Cir. 1978) (court excludes prior conviction for crime committed while a juvenile without discussing whether the defendant was tried as an adult).