PUBLIC LAW 103-322—SEPT. 13, 1994 108 STAT. 1965 "(2) before a jury impaneled for the purpose of the hearing if— "(A) the defendant was convicted upon a plea of guilty; "(B) the defendant was convicted after a trial before the court sitting without a jury; "(C) the jury that determined the defendant's guilt was discharged for good cause; or "(D) after initial imposition of a sentence under this section, reconsideration of the sentence under this section is necessary; or "(3) before the court alone, upon the motion of the defendant and with the approval of the attorney for the government. A jury impaneled pursuant to paragraph (2) shall consist of 12 members, unless, at any time before the conclusion of the hearing, the parties stipulate, with the approval of the court, that it shall consist of a lesser number. "(c) PROOF OF MITIGATING AND AGGRAVATING FACTORS.— Notwithstanding rule 32(c) of the Federal Rules of Criminal Procedure, when a defendant is found guilty or pleads guilty to an offense under section 3591, no presentence report shall be prepared. At the sentencing hearing, information may be presented as to any matter relevant to the sentence, including any mitigating or aggravating factor permitted or required to be considered under section 3592. Information presented may include the trial transcript and exhibits if the hearing is held before a jury or judge not present during the trial, or at the trial judge's discretion. The defendant may present any information relevant to a mitigating factor. The government may present any information relevant to an aggravating factor for which notice has been provided under subsection (a). Information is admissible regardless of its admissibility under the rules governing admission of evidence at criminal trials except that information may be excluded if its probative value is outweighed by the danger of creating unfair prejudice, confusing the issues, or misleading the jury. The government and the defendant shall be permitted to rebut any information received at the hearing, and shall be given fair opportunity to present argument as to the adequacy of the information to establish the existence of any aggravating or mitigating factor, and as to the appropriateness in the case of imposing a sentence of death. The government shall open the argument. The defendant shall be permitted to reply. The government shall then be permitted to reply in rebuttal. iTie burden of establishing the existence of any aggravating factor is on the government, and is not satisfied unless the existence of such a factor is established beyond a reasonable doubt. The burden of establishing the existence of any mitigating factor is on the defendant, and is not satisfied unless the existence \ of such a factor is established by a preponderance of the information. "(d) RETURN OF SPECIAL FINDINGS.— The jury, or if there is no jury, the court, shall consider all the information received during the hearing. It shall return special findings identifying any aggravating factor or factors set forth in section 3592 found to exist and any other aggravating factor for which notice has been provided under subsection (a) found to exist. A finding with respect to a mitigating factor may be made by 1 or more members of the jury, and any member of the jury who finds the existence of a mitigating factor may consider such factor established for purposes of this section regardless of the number of jurors who
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