The man, whose identity was withheld by the police, had installed a video camera on the small basket containing chalks on his desk in the homeroom class he instructs, in June.
The camera was bought with money from the school for support for teachers’ research. The secretly installed spy camera held a five-minute footage of the students during the self-study time.
The man testified to the police that the camera was for academic purposes only.
The police are continuing the investigation.