The Eleventh Circuit rejected a number of challenges in affirming the defendants' sentences for drug trafficking and unlawful possession of firearms, holding that the district court did not plainly err in shackling the defendants during trial without stating its reasons in the record and that the district court did not abuse its discretion in interviewing jurors in camera regarding their safety concerns and summarizing those interviews for the parties. The Court also concluded that the indictments failure to allege the defendants' mens rea as required under Rehaif v. United States did not deprive the court of jurisdiction and the plain error of convicting the defendants of unlawful possession of firearm did not warrant reversal where the government would have been able to prove their knowledge.