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Food and Beverage
4 min read
Areas of Expertise :
Combustion, Occupational Safety And Health (OSHA), Industrial Hygiene, Explosions, Workplace Safety
Published Date:
Last Modified Date:
Jurisdiction:
Federal. Western District of Wisconsin
On May 31, 2017, an industrial explosion occurred at the Didion Milling Inc. corn mill in Cambria, Wisconsin, resulting in five worker fatalities, multiple injuries, and extensive property damage. Investigations by the Occupational Safety and Health Administration (OSHA) and the U.S. Chemical Safety and Hazard Investigation Board (CSB) revealed significant violations of OSHA safety standards, including failures to control combustible dust hazards and falsified safety documentation.
The resulting litigation United States v. Didion Milling Inc. led to criminal prosecutions, civil penalties, and mandatory compliance reforms. This case study explores key legal developments in OSHA enforcement, the role of expert witnesses in industrial accident litigation, and lessons for attorneys handling workplace safety, regulatory compliance, and environmental liability cases.
An explosion at Didion Milling's corn processing plant resulted in five deaths and numerous injuries. OSHA and CSB investigations determined that the explosion was caused by accumulated combustible corn dust, a recognized industrial hazard. The incident drew nationwide attention to occupational safety violations in the grain handling and milling industry.
Subsequent investigations cited Didion Milling for multiple violations of OSHA's grain handling standards under 29 CFR 1910.272. Deficiencies were found in housekeeping procedures, dust control systems, and the accuracy of facility documentation. Altered cleaning logs were identified as a contributing factor to regulatory noncompliance, setting the stage for legal action.
The U.S. Department of Justice filed criminal charges against Didion Milling Inc. and several executives. Allegations included conspiracy, obstruction of justice, and violations of the Clean Air Act, stemming from falsified safety records and inadequate dust hazard mitigation. Defendants included Derrick Clark and Shawn Mesner, both holding key operational roles.
Didion Milling pleaded guilty to multiple counts of safety and environmental violations. The company agreed to pay $1 million in fines and $10.25 million in restitution to the victims' families. The plea agreement also required a five-year corporate probation period with third-party monitoring of OSHA compliance and workplace safety programs.
Derrick Clark and Shawn Mesner were convicted of conspiracy and obstructing OSHA investigations. Evidence included altered facility inspection records and testimony about failure to address combustible dust risks. The convictions emphasized personal accountability for workplace safety violations.
Clark and Mesner received two-year federal prison sentences. Didion Milling implemented corrective measures including OSHA training programs, routine housekeeping audits, and enhanced reporting obligations under court supervision. The case reflected broader trends in regulatory enforcement of occupational safety laws.
The CSB issued its final findings on the incident, citing systemic dust hazard management failures and noncompliance with OSHA standards. Recommendations were issued for improving combustible dust prevention practices across the grain processing industry. Technical consultants contributed to the analysis.
Court:
United States District Court for the Western District of Wisconsin
Case Name:
United States v. Didion Milling Inc., et al.
Fire and Explosions Investigations
Industrial Accidents
Safety Compliance
Clean Air Act
Environmental Compliance
Grain
Worker Safety
On May 31, 2017, an industrial explosion occurred at the Didion Milling Inc. corn mill in Cambria, Wisconsin, resulting in five worker fatalities, multiple injuries, and extensive property damage. Investigations by the Occupational Safety and Health Administration (OSHA) and the U.S. Chemical Safety and Hazard Investigation Board (CSB) revealed significant violations of OSHA safety standards, including failures to control combustible dust hazards and falsified safety documentation.
The resulting litigation United States v. Didion Milling Inc. led to criminal prosecutions, civil penalties, and mandatory compliance reforms. This case study explores key legal developments in OSHA enforcement, the role of expert witnesses in industrial accident litigation, and lessons for attorneys handling workplace safety, regulatory compliance, and environmental liability cases.
An explosion at Didion Milling's corn processing plant resulted in five deaths and numerous injuries. OSHA and CSB investigations determined that the explosion was caused by accumulated combustible corn dust, a recognized industrial hazard. The incident drew nationwide attention to occupational safety violations in the grain handling and milling industry.
Subsequent investigations cited Didion Milling for multiple violations of OSHA's grain handling standards under 29 CFR 1910.272. Deficiencies were found in housekeeping procedures, dust control systems, and the accuracy of facility documentation. Altered cleaning logs were identified as a contributing factor to regulatory noncompliance, setting the stage for legal action.
The U.S. Department of Justice filed criminal charges against Didion Milling Inc. and several executives. Allegations included conspiracy, obstruction of justice, and violations of the Clean Air Act, stemming from falsified safety records and inadequate dust hazard mitigation. Defendants included Derrick Clark and Shawn Mesner, both holding key operational roles.
Didion Milling pleaded guilty to multiple counts of safety and environmental violations. The company agreed to pay $1 million in fines and $10.25 million in restitution to the victims' families. The plea agreement also required a five-year corporate probation period with third-party monitoring of OSHA compliance and workplace safety programs.
Derrick Clark and Shawn Mesner were convicted of conspiracy and obstructing OSHA investigations. Evidence included altered facility inspection records and testimony about failure to address combustible dust risks. The convictions emphasized personal accountability for workplace safety violations.
Clark and Mesner received two-year federal prison sentences. Didion Milling implemented corrective measures including OSHA training programs, routine housekeeping audits, and enhanced reporting obligations under court supervision. The case reflected broader trends in regulatory enforcement of occupational safety laws.
The CSB issued its final findings on the incident, citing systemic dust hazard management failures and noncompliance with OSHA standards. Recommendations were issued for improving combustible dust prevention practices across the grain processing industry. Technical consultants contributed to the analysis.
Combustion Expert Witness
Provided technical analysis on dust ignition risks, accumulation thresholds, and industry standards for dust hazard prevention.
Occupational Safety and Health (OSHA) Compliance Expert Witness
Assessed whether company policies and operations aligned with OSHA regulations, including documentation and hazard controls.
Fire and Explosion Investigators Expert Witness
Reconstructed the incident, identified ignition points, and analyzed explosion dynamics to support legal causation theories.
Industrial Hygiene Expert Witness
Evaluated dust exposure risks, air quality monitoring data, and the adequacy of engineering and administrative controls.
Environmental Compliance Expert Witness
Reviewed the facility’s obligations under the Clean Air Act and assessed the accuracy of emissions and sanitation reporting.
The case of United States v. Didion Milling Inc. illustrates the serious legal consequences of noncompliance with OSHA regulations and environmental laws. The incident underscores how industrial accidents tied to workplace safety violations can evolve into multi-agency investigations, criminal indictments, and corporate reform mandates. For attorneys and risk managers, the case offers important lessons about OSHA enforcement trends, documentation practices, and the role of expert witnesses in occupational safety litigation. It also highlights how courts may impose probationary conditions requiring rigorous internal oversight and third-party evaluations to improve future safety compliance.
What caused the Didion Milling explosion?
The explosion was caused by the ignition of accumulated combustible corn dust, which investigators linked to inadequate housekeeping and dust hazard controls.
What OSHA violations were cited in this case?
Cited violations included failure to manage combustible dust, altered safety documentation, and lack of proper emergency response protocols under 29 CFR 1910.272.
Who was held legally responsible?
Two company executives, Derrick Clark and Shawn Mesner, were convicted for conspiracy and obstruction related to workplace safety documentation.
How did expert witnesses contribute to the case?
Experts analyzed combustible dust conditions, OSHA compliance, air quality risks, and regulatory reporting practices to support government findings.
What reforms were implemented under the corporate probation agreement?
Reforms included third-party OSHA compliance monitoring, dust control program enhancements, employee retraining, and periodic regulatory reporting.
Combustion Expert Witness
Provided technical analysis on dust ignition risks, accumulation thresholds, and industry standards for dust hazard prevention.
Occupational Safety and Health (OSHA) Compliance Expert Witness
Assessed whether company policies and operations aligned with OSHA regulations, including documentation and hazard controls.
Fire and Explosion Investigators Expert Witness
Reconstructed the incident, identified ignition points, and analyzed explosion dynamics to support legal causation theories.
Industrial Hygiene Expert Witness
Evaluated dust exposure risks, air quality monitoring data, and the adequacy of engineering and administrative controls.
Environmental Compliance Expert Witness
Reviewed the facility’s obligations under the Clean Air Act and assessed the accuracy of emissions and sanitation reporting.
The case of United States v. Didion Milling Inc. illustrates the serious legal consequences of noncompliance with OSHA regulations and environmental laws. The incident underscores how industrial accidents tied to workplace safety violations can evolve into multi-agency investigations, criminal indictments, and corporate reform mandates. For attorneys and risk managers, the case offers important lessons about OSHA enforcement trends, documentation practices, and the role of expert witnesses in occupational safety litigation. It also highlights how courts may impose probationary conditions requiring rigorous internal oversight and third-party evaluations to improve future safety compliance.
What caused the Didion Milling explosion?
The explosion was caused by the ignition of accumulated combustible corn dust, which investigators linked to inadequate housekeeping and dust hazard controls.
What OSHA violations were cited in this case?
Cited violations included failure to manage combustible dust, altered safety documentation, and lack of proper emergency response protocols under 29 CFR 1910.272.
Who was held legally responsible?
Two company executives, Derrick Clark and Shawn Mesner, were convicted for conspiracy and obstruction related to workplace safety documentation.
How did expert witnesses contribute to the case?
Experts analyzed combustible dust conditions, OSHA compliance, air quality risks, and regulatory reporting practices to support government findings.
What reforms were implemented under the corporate probation agreement?
Reforms included third-party OSHA compliance monitoring, dust control program enhancements, employee retraining, and periodic regulatory reporting.
Fire and Explosions Investigations
Industrial Accidents
Safety Compliance
Clean Air Act
Environmental Compliance
Grain
Worker Safety
Wage And Hour Disputes, +4
Food and Beverage
Food And Beverage, +4
Food and Beverage