United States v. Barnett Fung

Court of Appeals for the Seventh Circuit·Decided July 24, 2026·No. 25-1605·Published·Pryor

Opinion

In the

United States Court of Appeals For the Seventh Circuit ____________________ No. 25-1605 UNITED STATES OF AMERICA, Plaintiff-Appellee, v.

BARNETT K. FUNG, Defendant-Appellant. ____________________

Appeal from the United States District Court for the Northern District of Illinois, Eastern Division. No. 1:20-CR-00759(1) — Jorge L. Alonso, Judge. ____________________

ARGUED DECEMBER 9, 2025 — DECIDED JULY 24, 2026 ____________________

Before HAMILTON, ST. EVE, and PRYOR, Circuit Judges. PRYOR, Circuit Judge. A jury convicted Dr. Barnett K. Fung of knowingly and intentionally dispensing a controlled sub- stance outside of the usual course of professional practice and without a legitimate medical purpose in violation of 21 U.S.C. § 841(a). The district court sentenced him to six months’ incar- ceration and imposed a $50,000 fine. Dr. Fung now appeals, challenging the sufficiency of the evidence supporting his conviction, the district court’s evidentiary rulings, the denial 2 No. 25-1605

of his motion for a mistrial, and the imposition of a fine at sentencing. Finding none of Dr. Fung’s challenges persuasive, we affirm. I. BACKGROUND Dr. Fung was a podiatrist licensed to practice medicine in Illinois who held a Drug Enforcement Administration (“DEA”) registration number, permitting him to prescribe controlled substances. After an investigation into his opioid prescription practices, a grand jury indicted Dr. Fung in a su- perseding indictment on 74 charges of violating 21 U.S.C. § 841(a)—each count represented an individual opioid pre- scription the government alleged was unlawful. Specifically, Counts One through Six involved prescriptions to Dennis King, an undercover DEA agent purporting to be Frank Cas- tle; Count Seven covered a prescription to Emilia Fernandez, an undercover DEA agent purporting to be Emilia Figueroa; Counts Eight through 28 involved prescriptions to Dr. Fung’s patient S.J.; Counts 29 through 48 involved prescriptions to Dr. Fung’s patient T.S.; and Counts 49 to 74 covered prescrip- tions to Dr. Fung’s patient Y.E. A jury found Dr. Fung not guilty on 73 counts but convicted him on Count Seven. A. Factual Background The following facts underlying Dr. Fung’s conviction on Count Seven are set forth “in the light most favorable to the government.” United States v. Jones, 79 F.4th 844, 847 (7th Cir. 2023). On April 5, 2017, Special Agent Fernandez posed as a pa- tient named Emilia Figueroa and visited Dr. Fung at his office while wearing a hidden audio and video recording device. At the beginning of her appointment, Special Agent Fernandez No. 25-1605 3

indicated that “Frank Castle,” another undercover DEA agent who posed as a patient, recommended she visit Dr. Fung. Dr. Fung asked Special Agent Fernandez what was wrong, and she answered she didn’t “have pain, just discomfort” in her feet from “waitressing long hours.” Special Agent Fernandez explained that some other “girls” and “Frank” would give her pills to help, but she emphasized she was “not in pain” and was experiencing “just discomfort.” In response, Dr. Fung told Special Agent Fernandez the pills “from Frank” were narcotics. And then the following exchange occurred: FUNG: You will get addicted after a while. You will hurt your heart, your lung, and your liver.… Especially if you don’t have pain it’s just making you feel comfortable because that is a narcotic portion. The narcotic portion makes you feel comfortable. FERNANDEZ: Yes. FUNG: Right. So I really don’t advise you to take it, but if you are here and it’s the first time you come, I will write some for you. FERNANDEZ: Okay thank you doc. Dr. Fung prescribed Special Agent Fernandez 90 pills of hydrocodone, an opioid, in a dosage strength of 10mg, com- bined with 325mg of acetaminophen (a combination com- monly known by its brand name Norco). Dr. Fung did so without taking Special Agent Fernandez’s vital signs, asking her to remove her shoe, examining her foot, making a diagno- sis, creating a treatment plan of care, or documenting the pa- tient visit. Moreover, during her visit, Special Agent Fernan- dez did not complete any forms, and she was never asked 4 No. 25-1605

about her mental health or medical history. Dr. Fung, though, did ask Special Agent Fernandez if she had insurance, to which she responded she did not, and so he charged her $80 for the visit. B. Pretrial Motions In advance of trial, Dr. Fung filed a motion in limine to ex- clude evidence and arguments regarding patient addiction as unduly prejudicial under Federal Rule of Evidence 403. The district court granted the motion in part, finding the govern- ment could elicit testimony about his patients’ addictions only “to the extent that the testimony is directed to what Dr. Fung knew about them.” In that same motion in limine, Dr. Fung sought to bar the testimony of the government’s witness Thinh Nguyen, a pharmacist who worked at a Walgreens near Dr. Fung’s of- fice. Dr. Fung argued that Nguyen’s testimony would be im- proper expert testimony presented by a lay witness in viola- tion of Federal Rule of Evidence 701 and was also unduly prej- udicial under Rule 403. In response, the government submit- ted that Nguyen would testify to the fact that he told Dr. Fung that his prescriptions were flagged as abnormal and that the pharmacy would no longer fill them. This testimony, in the government’s view, was not opinion testimony and was rele- vant to demonstrating Dr. Fung’s knowledge and intent. The district court agreed. To prevent Nguyen’s testimony from trespassing into expert territory, though, the court limited Nguyen’s testimony to “a description … in factual terms, not normative terms, of what [Nguyen] observed, the fact that [Nguyen] reached out, [Nguyen’s] interactions with [Dr. Fung], and the resulting decision to stop filling [Dr. Fung’s] No. 25-1605 5

prescriptions.” The court forbade testimony “about [Ngu- yen’s] own conclusions[] [or] own opinions.” C. Trial Dr. Fung proceeded to trial on October 22, 2024. The jury reviewed the audio and video recording from Special Agent Fernandez’s visit. It also heard testimony from multiple lay witnesses, including, as relevant here, DEA Diversion Inves- tigator Anita Kasza, Nguyen, and Special Agent Fernandez. And the jury heard expert testimony from Dr. Adam Fleischer, an expert in the field of podiatry, and Dr. Timothy King, an expert in the field of pain management. 1 Trial evidence revealed that during an interview with In- vestigator Kasza, Dr. Fung identified certain of his patients as “problem patients” who may have been drug-seeking or abusing their medications. Dr. Fung also explained that he was a “softy” who knew he should be “tougher” with the “problem patients.” And when questioned by Investigator Kasza, Dr. Fung did not recognize the name Emilia Figueroa, the pseudonym Special Agent Fernandez used. The jury also heard from Nguyen who testified “there was a time that [the pharmacy] saw a lot of prescriptions from Dr. Fung.” Because of this high volume, Nguyen called Dr. Fung “to verify … [that a] prescription [was] valid[] [and] to make

1 Other government witnesses who testified included T.S. (patient), Y.E. (patient), S.J. (patient), Dennis King (undercover law enforcement officer who was Dr. Fung’s patient under the pseudonym Frank Castle), and Joshua Blankenship (DEA Special Agent who conducted a search of Dr. Fung’s office). Dr. Fung called two witnesses: Genevieve Kelley (an em- ployee at Dr. Fung’s office) and Dr.

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