Bradley John Quay, 27, appeared for drink-driving on March 16.
The Rapaura man was stopped by police while driving in Nelson St about 1.40am. He got out of his car and stumbled, and his speech was slurred, police prosecutor Sergeant Mark Harris said.
Quay underwent a breath-screening test, which showed he had a breath-alcohol level of 805mcg. He told police he was just going to get smokes and he should not have been driving.
The judge said anyone with that level of alcohol in their system may have problems with alcohol, but he was prepared to treat it as an isolated incident.
"You deserve credit for not having been before the court at all until now but you have made quite a first entrance with driving at twice the legal limit," he said.
He fined Quay $700 and disqualified him from driving for six months.
Anita Denise McLean, 37, admitted driving at more than twice the legal breath alcohol limit.
The Blenheim woman was stopped by police after she was seen driving out of a driveway in Charles St on March 23. She had a breath alcohol level of 987 micrograms per litre of breath. The legal limit is 400mcg. She told police she was just moving her car out of the driveway.
McLean was fined $500 and disqualified from driving for six months.
The Marlborough Express