It is believed the cab driver was working for Auckland Co-op Taxis at the time he was pulled over but yesterday chairman Jacob Patel said police and NZTA were unable to confirm whether the driver was one of his.
NZME. informed the company of the allegation on Friday and Mr Patel said since then they had initiated their own investigation.
Staff would look at GPS logs of the fleet and if necessary, CCTV footage from inside the cabs.
However, that usually only stretched back seven days.
Mr Patel said if one of his drivers was arrested for drink driving their licence was revoked by police and automatically suspended by Auckland Co-op Taxis.
He was confident that if the driver worked for him there was no chance he was on the road or had been since being charged.
Mr Patel said they were "very strict" with their staff and prided themselves on their good reputation.
NZTA said it would not comment on individual cases before they had been dealt with by the court but any cases of drink driving were a huge concern, especially seeing as taxis were vital in reducing such crimes.
If the man is convicted of drink driving, he will face a mandatory disqualification of at least six months and will have to reapply for a P (passenger) endorsement on their licence - which is required to work in the industry - at the conclusion of the ban.
But if he does not pass the agency's "fit and proper person check" he will be declined.
The maximum penalty for driving with excess breath alcohol is three months imprisonment, a $4500 fine and a minimum disqualification period of six months.