There has been further criticism of the police for delays in investigating electoral law breaches and calls for the job to be handed to another body.
Electoral law expert Graeme Edgeler told a select committee inquiry into the 2011 election that police were quick to consider issues such as people voting twice, but when more complex issues were sent to police "it seems very little happens because police perhaps do have more serious things to do".
Mr Edgeler said minor breaches should be dealt with by a fine so police time was not wasted but candidates would realise there was a consequence for breaching the rules.
The Electoral Commission has made a similar call in its report to the committee on the election, saying it was concerned about the priority police gave to referrals on more complex electoral law issues. It suggested another enforcement agency or a Crown solicitor be charged with investigating breaches.
Blogger and National Party pollster David Farrar, who has been involved in National Party campaigns, urged the committee to recommend to Government that police should not be the enforcement body for most electoral offences. He said the commission had raised its concerns "very diplomatically".