The recent law came into effect as part of an amendment to the Criminal Procedure Amendment (Domestic Violence Complaints) Act 2014.

Evidence-in-chief can be recorded as the complainant's statement immediately following an alleged assault.

Front line workers said the change shows the impacts of domestic violence and has achieved real results in the Hastings.

Senior Constable Taya Bailey regularly takes statements from complainants in her role as domestic violence liaison officer.

She said there have been four cases recently where the accused pleaded not guilty, a hearing commenced where the recording was played and the accused was convicted.

"The recording really brings the emotion into the court room and is compelling evidence for the Magistrate to see," she said.

Some defendants have even changed their pleas to guilty after police served the recordings, she said.

Another positive is that complainants have told police the court process is now less traumatic, particularly because they don't have to spend much time in the witness box.

The Domestic Violence Court Advocacy Service's Sandra Sheridan said using the recordings removes the chance of errors due to the immediacy of the statement.

"It's also meant we've had a few perpetrators change their plea to guilty without the victim having to be present in court," she said.

Senior Constable Bailey said general duties police, who received additional training in recording statements, reported the new method was saving time at crime scenes.

"The initiative is definitely having a positive impact," she said.

Mrs Sheridan echoed her uniformed colleague's words, saying she "absolutely hopes" the method continues to be used.