Counsel Russell Checketts said Mahaki worked in the shearing industry and his job included driving the shearing gang's van.
Judge Phillips said the defendant drove the van to a police station "to talk to them about a matter they wanted to talk to you about" and smelled of alcohol, so was breath-tested.
"The facts, as disclosed to me, were that you drank a bottle of bourbon before you drove ... "
Mahaki was unsuitable for home detention.
He was disqualified from driving indefinitely and, when he was permitted to drive again, he would have to have a zero-alcohol licence again, the judge said.
He warned the defendant's employers that if the van was used again "in the commission of an offence", it would be forfeited.
• Drivers can be ordered by the courts to get a zero-alcohol licence, which means they must maintain a zero-alcohol limit while driving. That limit applies for three years.