
    UNITED STATES of America, Appellee, v. Andrew CONSTANTINOU, Defendant-Appellant, Genevieve Salvatore, Lawrence Dressler, Kwame Nkrumah, a/k/a Roger Woodson, Jacques Kelly, Defendants.
    
    No. 14-4725.
    United States Court of Appeals, Second Circuit.
    Jan. 22, 2016.
    David T. Huang, Assistant United States Attorney, District of Connecticut (Mark E. Coyne, Assistant United States Attorney, District of New Jersey (of counsel), on the brief), for Loretta E. Lynch, United States Attorney General, Washington, DC, and Paul J. Fishman, United States Attorney for the District of New Jersey, Newark, NJ, for Appellee.
    Norman A. Pattis (Daniel M. Erwin, on the brief), The Pattis Law Firm, LLC, New Haven, CT, for Defendant-Appellant.
    PRESENT: ROBERTA. KATZMANN, Chief Judge, AMALYA L. KEARSE, Circuit Judge, LORNA G. SCHOFIELD, District Judge.
    
    
      
      The Clerk of Court is directed to amend the caption as indicated above.
    
    
      
       The Honorable Loma G. Schofield, of the United States District Court for the Southern District of New York, sitting by designation,
    
   SUMMARY ORDER

Defendant-Appellant Andrew Constanti-nou appeals a judgment of conviction en~ tered on December 22,2014, by the United States District Court for the District of Connecticut (Hall, C.J.), following a jury verdict finding him guilty of conspiracy to commit bank, mail, and wire fraud in violation of 18 U.S.C. § 1349. We assume the parties’ familiarity with the underlying facts, procedural history, and issues on appeal.

First, Constantinou advances the novel argument that the district court “constructively” closed the courtroom, and thereby violated his Sixth Amendment right to a public trial, when, during voir dire, it conducted sidebars with certain jurors in open court, on the record, and in the presence of counsel for all parties. Constantinou concedes that he did not object to the district court’s use of sidebars in this manner and that, at best, his constructive-closure theory is subject to plain-error review. Con-stantinou further concedes that he “raises on appeal what is apparently an issue of first impression, to wit: Whether intermittent voir dire conducted at sidebar violates his Sixth Amendment right to a public trial,” Appellant Br. 19, and that the procedure he complains of is “common practice in the District of Connecticut,” id. at 6.

To succeed on a claim under plain-error review, “an appellant must demonstrate,” among other things, that the purported “error is clear or obvious, rather than subject to reasonable dispute.” United States v. Bastian, 770 F.3d 212, 219 (2d Cir.2014) (quoting United States v. Marcus, 560 U.S. 258, 262, 130 S.Ct. 2159, 176 L.Ed.2d 1012 (2010)). Even assuming—and it is a generous assumption—that' Constantinou has identified an error in the district court’s use of sidebars, such error cannot be “clear or obvious” if we have never questioned the procedure and it is common practice. Cf. Bastian, 770 F.3d at 221; United States v. Weintraub, 273 F.3d 139, 152 (2d Cir.2001). Accordingly, his claim fails.

Second, Constantinou contends that the district court erroneously refused his requests to sever his trial from that of co-defendant Jacques Kelly. “Whether to grant or deny a severance motion is committed to the sound discretion of the trial judge. The district court’s exercise of that discretion is virtually unreviewable.” United States v. Salameh, 152 F.3d 88, 115 (2d Cir.1998) (citations and quotation marks omitted). Furthermore, “[tjhere is a preference in the federal system for joint trials of defendants who are indicted together. This preference is particularly strong where, as here, the defendants are alleged to have participated in a common plan or scheme.” Id. (citations and quotation marks omitted).

Constantinou argues that severance was warranted because his defense conflicted with that of his co-defendant. The district court addressed this argument before and after trial, concluding that severance was not necessary because the defenses were not mutually exclusive. See Gov’t App. 46; United States v. Constantinou, No. 3:11—CR-192 (JCH), 2014 U.S. Dist. LEXIS 122915, at *14-15 (D.Conn. Sept. 2, 2014); see also United States v. Cardascia, 951 F.2d 474, 484 (2d Cir.1991). We conclude that the district court did mot abuse its discretion in making this determination.

Third, Constantinou contends that the district court erroneously declined to conduct a hearing to explore an alternate juror’s post-verdict allegations of pre-de-liberation juror misconduct. “We review for abuse of discretion the district court’s handling of alleged juror misconduct.” United States v. Farhane, 634 F.3d 127, 168 (2d Cir.2011). “A district court’s investigation of juror misconduct or bias is a delicate and complex task. Therefore, a trial judge has broad flexibility in such matters, especially when the alleged prejudice results from statements by the jurors themselves, and not from media publicity or other outside influences.” United States v. Peterson, 385 F.3d 127, 134 (2d Cir.2004) (citations and quotation marks omitted).

Here, an alternate juror provided multiple unsolicited communications to the district court describing what he believed were improper pre-deliberation comments from his fellow jurors. The district court inquired about thé alternate juror’s availability to discuss the allegations, but the alternate juror indicated there was nothing more to add to what had been stated. The district court then received full'briefing on the issue from the parties, and, in a thorough opinion exploring the issue, it explained that no hearing was necessary because there was not “clear, strong, substantial and incontrovertible evidence that a specific nonspeculative impropriety has occurred which could have prejudiced the trial.” App. 101 (quoting United States v. Stewart, 433 F.3d 273, 302-03 (2d Cir. 2006)). We conclude that the district court’s handling of this matter was an appropriate exercise of its discretion. Cf. Peterson, 385 F.3d at 135.

We have considered the remaining arguments advanced on appeal and find no basis for reversal. For the reasons stated herein, the judgment of the district court is AFFIRMED.  