The National Police Agency will only ask the Justice Ministry for information on sex offenders who have served prison time, NPA Commissioner General Iwao Uruma said Thursday.

It has recently been suggested that a mechanism be put in place that would allow police officers to keep track of sex offenders after they are released from prison. Uruma suggested that those who received suspended sentences or were arrested but not indicted be excluded from the scheme.

The list of sex offenders covered under the proposed plan "will stretch to infinity unless we focus only on those who were malicious enough to deserve imprisonment," Uruma said at a regular news conference.