OPINION
John Doe, a fourteen year old member of the Salt River Pima-Marieopa Indian Com-mumty, appeals his conviction on two counts of juvenile delinquency. He contends that use of his inculpatory statements violated the Fifth Amendment and the Federal Rules of Criminal Procedure. We have jurisdiction, 12 U.S.C. § 1291, and affirm.
*546 I. BACKGROUND
Doe was convicted after a one day bench trial of two acts of juvenile delinquency, see 18 U.S.C. §§ 5031-5037, for (1) assault with a dangerous weapon with intent to do bodily harm, 18 U.S.C. § 113(c), and (2) use of a short-barreled shotgun during and in relation to a crime of violence, 18 U.S.C. § 924(c). Both charges arose out of the drive-by shooting of another juvenile Indian on the Salt River Indian Reservation. See 18 U.S.C. § 1153.
II. DISCUSSION
A. Waiver of Miranda Rights
Doe argues that the government failed to prove that he knowingly, intelligently and voluntarily waived his
Miranda
rights. We review de novo whether Doe voluntarily waived his
Miranda
rights and for clear error whether that waiver was knowing and intelligent.
United States v. Bautista-Avila,
Officer Arvizu, one of the investigating officers, testified that he read Doe his Miranda warnings from a “juvenile Miranda warnings form.” He further testified to the substance of those warnings. Doe indicated that he understood his rights and agreed to speak with the officers. Arvizu had no trouble communicating with Doe. Arvizu further testified that both Doe and his mother signed the Miranda form. However, the government was not able to produce the form.
Doe’s mother was present during the questioning, but Doe did not offer her or any other witness at the suppression hearing. Production of the signed Miranda form would have been helpful in establishing a valid waiver. Nonetheless, even without it, the unrebutted testimony of officer Arvizu established by a preponderance of the evidence,
see Colorado v. Connelly,
B. Invoking the Right to Counsel
Doe contends that custodial interrogation continued after he invoked his right to counsel. We review de novo whether a statement is sufficient to invoke the right to counsel.
United States v. Ogbuehi,
Officer Arvizu testified that near the end of a one hour interrogation, Doe’s mother made a statement to the effect that “maybe he ought to see an attorney.” To invoke the right to counsel, the suspect’s request must be clear and unambiguous.
Davis v. United States,
— U.S. -, --,
C.Violation of Discovery Rules
Doe contends that the district court erred when it refused to strike testimony concerning a second custodial statement, the substance of which was not disclosed to him.
See
Fed.R.Crim.P. 16(a)(1)(A). To prevail on this issue Doe must show “that the district court abused its discretion, [and] that the abuse resulted in prejudice to [his] substantial rights.”
United States v. Gonzalez-Rincon,
AFFIRMED.
