Group 1 - The measurement devices used at the Fukushima nuclear power plant were not properly tested and allegedly had falsified test certificates [2][4] - 90% of the problematic devices were used to monitor radiation effects on humans, while others measured radiation levels in the air [4] - Chiyoda Technics Co., which produced the devices, sold them to the Fukushima plant without completing the necessary tests, leading to concerns about data integrity [4] Group 2 - The Fukushima nuclear disaster in 2011 was preceded by a history of data falsification, with 199 instances of data manipulation reported since 1977 [4] - Despite the issues with the measurement devices, local authorities stated that there were other functioning devices in place, mitigating health and safety concerns [4] - Chiyoda Technics issued an apology regarding the incident on October 30 [4]