Before DNA testing technology was widely applied in the field of criminal investigation, fingerprints were indisputably the "prime criminal evidence."
Therefore, the Japanese Police Agency attempted to establish a national fingerprint database as early as the beginning of the nineteenth century, but this proved to be highly difficult. There was even some contention over the privacy rights of ordinary citizens in Japan, so currently, the Police Agency can only collect the fingerprints of criminal suspects.
In other words, if someone has committed a crime, their fingerprints would be in the police fingerprint database, ready to be identified by the second-generation "Infrared Regional Distributed Photosensitive Fingerprint Comparison System."
