United States v. Derrick Clark

140 F.4th 395
CourtCourt of Appeals for the Seventh Circuit
DecidedJune 10, 2025
Docket24-1320
StatusPublished

This text of 140 F.4th 395 (United States v. Derrick Clark) is published on Counsel Stack Legal Research, covering Court of Appeals for the Seventh Circuit primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
United States v. Derrick Clark, 140 F.4th 395 (7th Cir. 2025).

Opinion

In the

United States Court of Appeals For the Seventh Circuit ____________________ Nos. 24-1320 & 24-1321 UNITED STATES OF AMERICA, Plaintiff-Appellee, v.

DERRICK CLARK and SHAWN MESNER, Defendants-Appellants. ____________________

Appeals from the United States District Court for the Western District of Wisconsin. No. 22-cr-55-jdp — James D. Peterson, Chief Judge. ____________________

ARGUED DECEMBER 11, 2024 — DECIDED JUNE 10, 2025 ____________________

Before EASTERBROOK, BRENNAN, and ST. EVE, Circuit Judges. ST. EVE, Circuit Judge. Derrick Clark and Shawn Mesner worked for Didion Milling, Inc. (“Didion”), a corn milling company. In May 2017, Didion’s grain mill exploded, killing five employees. The Occupational Health and Safety Admin- istration (“OSHA”) investigated the explosion and ultimately referred Didion for criminal prosecution. 2 Nos. 24-1320 & 24-1321

The government charged Didion and several of its em- ployees with federal crimes relating to their work at the mill. Three of the defendants, including Clark and Mesner, pro- ceeded to trial. In this appeal, Clark and Mesner challenge the district court’s evidentiary rulings and jury instructions, the indict- ment, the sufficiency of the evidence underlying their convic- tions, and the constitutionality of their convictions. We vacate Mesner’s conviction on Count 4. For this count as to Mesner, we remand for an entry of judgment of acquittal and for fur- ther proceedings consistent with this opinion. Otherwise, we affirm. I. Background A. Factual History Didion processes raw corn into ingredients that it sells to food and beverage manufacturers, like General Mills and An- heuser-Busch. Clark and Mesner worked at Didion’s grain mill in Cambria, Wisconsin—Clark as Didion’s vice president of operations, and Mesner as Didion’s food safety superinten- dent. On May 31, 2017, Didion’s mill exploded, tragically killing five employees. After an investigation, OSHA issued citations and fines against Didion and referred it for criminal prosecu- tion. The government’s investigation uncovered wrongdoing related to falsification of records, false testimony, and con- spiracy to commit those and other similar offenses. This mis- conduct centered on two processes: Didion’s dust collection tracking and sanitation schedule. Nos. 24-1320 & 24-1321 3

1. Didion’s Baghouse Logs Grain milling generates significant amounts of grain dust, a pollutant. The Wisconsin Department of Natural Resources (“WDNR”) issues permits to companies like Didion to help regulate pollutants. Didion had to certify its continued com- pliance with its WDNR permit every six months. The submis- sion consisted of a compliance certification cover page and a deviation summary report, which required Didion to list known deviations from its permit. Among other things, Didion’s permit obligated Didion to monitor a parameter referred to as the baghouse pressure drop. Baghouses are pollution control devices that reduce emissions by capturing dust particles before they enter the air. The pressure drop is a measurement that reflects the effi- ciency of a baghouse. Didion’s baghouses had to remain at a pressure drop range between 1.5 and 8 inches, with an allow- ance to drop to 0.5 inches in certain circumstances. Mill work- ers (or “millers”) at Didion read the baghouse pressure drops and recorded them in baghouse logs. Evidence adduced at trial established that millers did not accurately record the baghouse pressures. Instead, when the baghouse pressure reading was below “2” or above “8,” mil- lers consistently reported the number into the baghouse logs as “2” or “8”—regardless of the precise pressure. Didion’s permit compliance certification covering January to June 2017 did not disclose this improper recording practice. Joseph Winch—a former Didion environmental manager who pleaded guilty—prepared the certification. Clark signed it. Apart from the bi-annual compliance certifications, Did- ion underwent inspections from the WDNR and other 4 Nos. 24-1320 & 24-1321

agencies. In May 2017, before the explosion, the WDNR con- ducted one such inspection—attended by both Winch and Clark. After the inspection, Winch emailed Didion’s baghouse logs from 2015 through 2017 to the WDNR in response to its request. All entries of “2” and “8” in the 2015 and 2016 logs had yellow highlighting. The 2017 spreadsheet did not con- tain the same color coding. Winch did not include Clark on the email transmitting the logs to the WDNR. Didion’s certification and baghouse log color coding—as benign as the latter may seem—play a pivotal role in many of Clark’s challenges on appeal. 2. Didion’s Master Sanitation Schedule Logbook The other process implicated by this appeal involved Did- ion’s cleaning logs, which are central to Mesner’s challenges. Didion maintained a Master Sanitation Schedule logbook to track compliance with Didion’s sanitation schedule. When workers completed cleaning tasks, they documented their in- itials and the date in the sanitation logbook. Shift superinten- dents reviewed and signed the logbook upon verification that workers completed required cleanings. Mesner, as Didion’s food safety and technical superintendent, signed each page to verify task completion. Former Didion employees testified at trial that workers and superintendents backfilled the sanitation logbook with- out verifying if anyone completed the cleanings. They testi- fied that they often did so at Mesner’s direction. One former shift superintendent stated that Mesner instructed him to stop writing “task not completed” in the sanitation logbook and, where he already had, to add an asterisk and indicate that cleanings were timely completed and verified. The witness Nos. 24-1320 & 24-1321 5

agreed that he “falsif[ied] the Master Sanitation Schedule” at “Mesner’s instruction.” B. Procedural History 1. Pretrial Proceedings In May 2022, a grand jury indicted Didion and six employ- ees on nine counts related to the unsafe operation of Didion’s mill and the conduct just described. The challenges Clark and Mesner raise on appeal implicate most of these counts. Count 1 charged Didion, Clark, Mesner, and others with a conspiracy to commit wire and mail fraud, in violation of 18 U.S.C. §§ 1341, 1343, and 1349. It alleged that the defendants conspired to deceive food safety auditors about Didion’s san- itation practices so the company could continue to sell mil- lions of dollars of milled corn ingredients to food and bever- age manufacturers. Count 4 charged Didion, Clark, Mesner, and others with conspiracy to commit three federal offenses—18 U.S.C. §§ 1519, 1001(a)(3), and 1505—in violation of 18 U.S.C. § 371.

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140 F.4th 395, Counsel Stack Legal Research, https://law.counselstack.com/opinion/united-states-v-derrick-clark-ca7-2025.