The eleventh-circuit affirmed Floyd Bostic’s convictions for conspiracy to commit wire fraud, aiding and abetting wire fraud, aiding and abetting aggravated identity theft, conspiracy to commit money laundering, concealment of money laundering, engaging in monetary transactions involving money laundering, and aiding and abetting the operation of an unlicensed money transmitting business. The court applied plain error review because Bostic failed to make a sufficient objection at trial to preserve an abuse-of-discretion standard. The court acknowledged that the district court plainly erred by admitting FBI Special Agent Evan Hurley’s testimony that Bostic’s financial activity was indicative of his knowledge that funds were fraudulently obtained, as this constituted an impermissible opinion on the defendant’s mental state under Federal Rule of Evidence 704(b). However, the court held that this error did not affect Bostic’s substantial rights because sufficient uninfected evidence supported the requisite mental state, including testimony from co-conspirator Ronald Vargas regarding the “Promoter” and Bostic’s own trial testimony explaining his rationale for engaging in withdrawals and intra-account transfers. Consequently, the convictions remain in effect.