The scheme that allows police to disclose a person's violent past to a partner has been used 158 times since it was launched in December 2015, Police Minister Paula Bennett says.
A disclosure request can be made to police by the partner of a potentially violent person, or a concerned third party.
Police can also proactively release information if they believe someone is at risk of violence from their partner.
Ms Bennett has given an example of that.
"Police have told me about a disclosure they made to a young woman who was in a relationship with a man in his early 20s," she said.
"He was known to have had multiple relationships with younger women where he became manipulative and used emotional abuse like threatening suicide if his partner left him.
"Police believed the woman was at risk as his behaviour was escalating towards becoming violent."
Ms Bennett said when police approached the woman, she said she had seen the man's behaviour deteriorating.
"As a result she made the decision to leave the relationship and move back in with family."