Prime Minister John Key says he's taking Pansy Wong's husband at his word, over any possible breaches of the rules on MPs' travel subsidies.
A Parliamentary Service report has found no systematic abuse of Mrs Wong's international travel rebate.
She resigned from Cabinet after admitting her subsidy had been misused when her husband, Sammy Wong, conducted private business during a trip to China.
The report found that was unplanned and inadvertent.
There were occasions when Mr Wong went on taxpayer-funded trips without his wife, but he told the investigation there were no other cases of him conducting personal business.
Mr Key says he has to take Mr Wong at his word.
Mrs Wong says she trusts her husband's word. She says her husband's assurances that he did not conduct business during their travel were closely examined during the investigation
But Labour says the investigation was a whitewash and it wants the Auditor-General to have a closer look at the Wongs' travel.