University Lab Worker Admits Trying to Poison Fellow Researcher After Becoming Envious Over Promotion
University Lab Worker Accused of Trying to Poison Colleague Following Promotion Dispute
Madison, Wisconsin – June 2026
A laboratory employee at the University of Wisconsin has been charged after authorities say he deliberately contaminated a colleague's water bottle and shoes with hazardous chemicals following growing resentment over a workplace promotion and other professional disagreements.
The case has shocked the academic community and raised concerns about workplace conflicts and laboratory safety in research institutions.
Longtime Colleagues
According to court documents, Makoto Kuroda, 41, and the alleged victim, identified only by his initials, TM, had worked together for several years at the university's Influenza Research Institute in Madison.
Investigators say the two researchers first met in 2017 and had maintained a professional relationship for approximately five years.
Over time, however, that relationship reportedly deteriorated.
Authorities allege that Kuroda became increasingly upset with his colleague over several issues, including what he considered an undeserved promotion.
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Strange Taste Raises Alarm
The investigation reportedly began in early April when TM attempted to drink from a water bottle that had been sitting on his desk.
According to police reports, he immediately noticed that the water tasted unusual and spat it out.
A co-worker who examined the bottle reportedly noticed an unusual odor.
A few days later, TM allegedly detected a strong chemical smell coming from his laboratory shoes, prompting him to contact authorities.
Hazardous Chemicals Discovered
Laboratory testing later found traces of chloroform in both the water bottle and the shoes, according to court filings.
Investigators said the concentration of the chemical was reportedly so high that certain testing methods could not accurately measure it.
Authorities also alleged that another chemical mixture containing paraformaldehyde had been used.
Both substances can pose serious health risks if improperly handled or ingested.
Alleged Confession
According to police documents, Kuroda allegedly admitted his actions both to the victim and to a university professor before later speaking with investigators.
Authorities say he told police he had become angry over several workplace issues, including:
- The victim's promotion;
- Alleged violations of laboratory safety procedures;
- Ongoing frustrations that had built up over time.
Court documents indicate that Kuroda allegedly stated that several issues had simply "added up."
Details of the Alleged Contamination
Investigators say Kuroda admitted taking a small quantity of chemicals from a workplace refrigerator and placing some of the mixture into his colleague's water bottle.
Police documents also allege that he placed chemicals inside the victim's shoes.
According to court records, investigators believe the suspect intended for the chemicals to make his co-worker ill and cause skin irritation.
Fortunately, the alleged victim reportedly did not suffer serious physical injuries.
Authorities Allege Online Research Was Used
Court filings further allege that Kuroda told investigators he had used artificial intelligence tools and online resources to research the amount of chemicals needed to achieve his intended result.
Police documents reportedly indicate that he wanted the victim to "feel bad" and believed that the individual somehow deserved what happened.
Charges Filed
Authorities have charged Kuroda with several offenses, including:
- Recklessly endangering safety;
- Tampering with a consumer product with intent to cause harm.
The charges remain allegations, and the case will proceed through the legal system.
If convicted, he could face significant penalties.
University Responds
University officials have not publicly disclosed additional details about the incident but have emphasized their commitment to maintaining a safe working environment for staff and researchers.
The case has sparked broader discussions about:
- Workplace stress in academic environments;
- Mental health and conflict resolution;
- Security protocols surrounding hazardous laboratory materials;
- The importance of reporting unusual behavior in professional settings.
Growing Concern About Workplace Violence
Experts note that while workplace disagreements are common, incidents involving alleged attempts to poison co-workers are extremely rare.
The case serves as a reminder that unresolved conflicts and personal grievances can sometimes escalate in dangerous and unexpected ways.
Authorities continue to investigate the circumstances surrounding the incident, and additional court proceedings are expected in the coming months.
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Legal Note
The allegations against Makoto Kuroda are based on court documents and statements from law enforcement authorities. He remains presumed innocent unless proven guilty in a court of law.
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