Agencies will gather continually updated personal information, which can then be assessed and analysed to determine if reoffending is more likely to take place, so that necessary action can be taken.
"This gives authorities another tool to try and prevent reoffending, to help keep children safe."
The register will not be open to the public but Mrs Tolley said the information might be released to parents, caregivers or a child's teacher if there is a significant threat to the safety of children.
All registered child sex offenders will be required to report to the Police within 72 hours of their release from prison or after receiving a non-custodial sentence if directed to register by a judge.
They will need to provide a range of information including fingerprints, photographs, aliases, address, workplace and employer, car registration, computer IP address and passport details.
They will have to notify police within 72 hours of any changes.
The Bill will also establish offences for failing to report or provide the required information with penalties of a fine of up to $2000 or one year in prison, or both. Penalties of up to a $4000 fine and a maximum jail term of 2 years will be established for those giving false or misleading information.
Authorised Police and Corrections staff, and authorised staff from relevant agencies such as the Ministry of Social Development and Housing New Zealand will be able to share relevant information in the register, allowing them to work together in the interests of public safety.
Convicted child sex offenders serving a sentence at the time the new legislation comes into force, or convicted afterwards, will need to be registered.
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