Snr Const Blackford said police national headquarters had notified the New Zealand Transport Agency about the use of overseas driver's licences.
"The advice from New Zealand police headquarters was that the New Zealand Government was a signatory to some international conventions on road traffic which were signed many years ago."
These conventions allowed visitors to New Zealand to drive on their home-country licence for up to a year and for New Zealanders to have the same allowances in a number of destinations.
"I think it's fairly safe to assume that all those years ago the number of overseas drivers ... coming to New Zealand would not reasonably have been foreseen," Snr Const Blackford said.
"Unfortunately, in this day and age almost everything made or produced seems to be able to be copied in very sophisticated ways, as was ... the case in the fatality in 2001 with the young Chinese driver - he was found to be driving on a fake driver's licence."
"In the recent fatality on the Lindis Pass there is no indication on the police file that the driver's licence was fake, however, what was clearly evident was the lack of experience of the Chinese driver involved which has been attributed to the deaths of two New Zealanders."
He said Mr McElrea had issued instructions for further inquiries to be made in relation to "the legal aspects of the accrediting of overseas persons with New Zealand driver's licences".
Calls to the NZTA by the Otago Daily Times were not returned.