MADISON, Wis. — A staff scientist at the University of Wisconsin-Madison faces serious charges after allegedly engaging in dangerous behavior linked to a conflict over workplace promotions. Makoto Kuroda, 41, is facing two felony charges in connection with an incident involving the tampering of a co-worker’s water and personal belongings.
Kuroda has been charged with second-degree recklessly endangering safety and tampering with household products. According to the police report, the matter arose at the university’s Influenza Research Institute when a co-worker reported a pungent chemical smell emanating from a water bottle and shoes left in an office.
The case began when the affected employee, referred to as TM, opened a new water bottle and consumed from it. Upon his return to the office two days later, he detected an unusual odor and a chemical taste that prompted him to discard the remaining liquid. Further investigation revealed similar issues with his lab shoes, leading coworkers to escalate the concern to university authorities.
UW-Madison police responded on April 6 and took immediate action by collaborating with the Madison Fire Department’s Hazardous Incident Team. The team analyzed the water bottle, discovering concerning levels of chloroform, which suggested a significant risk due to the chemical’s volatile nature.
Kuroda reportedly admitted his involvement to TM and supervisory staff shortly thereafter. He expressed remorse in a communication later captured in an email, also indicating his intent in the matter. The relationship between Kuroda and TM had soured over workplace dynamics, particularly following TM’s recent promotion, which Kuroda perceived as a slight against him.
In documenting his actions, Kuroda noted that he used laboratory chemicals — specifically paraformaldehyde and Trizol — to taint the water and shoes, believing these substances would merely cause discomfort and not result in serious harm. His admissions have raised concerns about ethical behavior in a setting that handles hazardous materials.
The ongoing investigation has revealed a lack of stringent tracking of these chemicals within the workplace. Employees typically had unrestricted access to them, and there were no visible security measures in place, such as surveillance cameras, to monitor their use.
While no reports of illness have surfaced, Kuroda acknowledged to law enforcement the potential health risks associated with the chemicals, including irritation and nausea. His stated goal was to instigate a feeling of unease in TM.
Kuroda was arrested on April 10, and the charges were formally filed four days later. If convicted, he faces up to 16 years in prison and substantial fines. He has been placed on administrative leave from the university while an internal investigation is ongoing, and his access to university facilities has been restricted.
At present, the case remains active, pending further chemical analysis and additional inquiries into workplace conduct. Authorities have indicated that further legal actions could emerge as the investigation progresses. As developments unfold, university officials express commitment to rigorous safety protocols in their laboratories while emphasizing the gravity of the allegations against Kuroda.