A staff member at a Japanese police forensic agency falsified hundreds of DNA test results over an extended period, a revelation that has shocked the country. As scientific evidence used as a central basis for investigations was found to have been fabricated, criticism is mounting over the management systems and overall examination procedures of Japanese investigative agencies.
According to NHK and other local media on Friday, Japan's National Police Agency recently announced through a special inspection that a staff member at the Forensic Science Laboratory of the Saga Prefectural Police Headquarters committed misconduct in a total of 239 DNA examinations over about seven years.
The investigation found that the staff member created false examination reports by recording DNA analysis results differently from the actual findings or by arbitrarily modifying examination data. The detected cases account for about 40% of all DNA examination work the staff member conducted alone.
In particular, the National Police Agency investigation reportedly confirmed more than 100 additional cases of fabrication beyond those identified by the Saga Prefectural Police in its own probe.
During the investigation, the staff member reportedly stated, "I didn't want to be told that my work was delayed," adding, "I was afraid of being seen as an incompetent employee who couldn't process cases within the deadline."
Experts point out that the cause of the incident was not only individual misconduct but also organizational management failures. DNA examination work was concentrated on a single staff member, and the verification procedures for results were also operated as a formality, allowing the problem to go undetected for a long time.
The Saga Prefectural Police Headquarters also acknowledged that most examination work was effectively run by a single person and that the review process by superiors was insufficient.
The staff member was dismissed last year and has been put on trial on charges including creating false official documents. Japan's National Police Agency issued severe warnings to executives deemed responsible for management and supervision, and separately imposed a disciplinary measure on the police headquarters chief.
The police explained that among the cases confirmed so far, there were no instances in which a wrong suspect was directly arrested or referred to prosecutors. However, the National Police Agency inspection noted that in 37 of all the fraudulent examinations, a normal analysis could have helped identify suspects.
The problem is that some materials were not properly preserved, making re-examination difficult in certain cases. As a result, concerns have emerged that it may be difficult to fully determine what impact the misconduct had on actual investigations.
Within the local legal community, some argue that internal police investigations alone cannot resolve public suspicions, and that an independent investigation involving outside experts is needed to uncover the truth.
As the controversy spread, Japan's National Police Agency launched an emergency review of scientific investigation examination procedures, including DNA, targeting police organizations nationwide. It plans to prevent similar cases from recurring by strengthening re-verification systems, distributing workloads, and improving supervision systems.
