A police officer resigned late last year after being investigated for theft in the aftermath of the February 2011 Christchurch earthquake.
It was alleged that three sets of sunglasses were taken from a cordoned-off suburban shop by an officer from the North Island.
Assistant Commissioner for the southern region, Dave Cliff, said the matter was investigated as soon as it was brought to police notice.
"We are very clear that any allegations against police must be investigated thoroughly and promptly. We demand the highest ethical standards from all police officers and police employees.''
An inquiry was initiated immediately and was conducted by senior police investigators. The constable was suspended once evidence of his involvement emerged. He did not admit the theft.