Police have re-opened the investigation into the Todd Barclay recording scandal following intense media scrutiny.
Assistant commissioner (investigations) Richard Chambers said in a statement police have "commenced speaking to a number of individuals who may have relevant information".
Any new evidence which is gathered will be carefully considered to determine what, if any, impact it has on the outcome of the original investigation.
"This will be a thorough process with oversight from a senior detective, however at this stage we are unable to put a timeframe on how long it might take."
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Mr Barclay announced last week that he would be standing down at the end of his current term in Parliament.
It was revealed last week that a payment of taxpayer money had been made to settle an employment dispute in Mr Barclay's office, after he allegedly secretly recorded staff member Glenys Dickson.
Mr Barclay told Prime Minister Bill English that he made the recording, and Mr English admitted that he spoke to police about it in April 2016.
More to come.