It's the end of the road for Paul Blair, with the country's highest court refusing him permission to appeal his cannabis convictions.
The Rotorua beneficiaries advocate and qualified barrister, who is in his 60s, must now begin his three months' community detention and 100 hours' community work imposed in May last year.
In a judgment released this week, the Supreme Court refused Blair leave to appeal his conviction for selling cannabis to an undercover police officer and one for possessing cannabis for supply in 2010.
"Overall, the applicant [Blair] raised no matter of general or public importance. Nor is there any indication a substantial miscarriage of justice has occurred," the judgment said.
Blair was originally found guilty of the charges in 2011, but appealed and was granted a retrial. In 2013 he was found guilty again.
Earlier this year the Court of Appeal threw out a second appeal, which led to Blair taking his case all the way to the Supreme Court.
Blair, who has always maintained his innocence, said he was devastated by this week's decision, but there was nothing more he could do.
"That's the end of the road," he said.
"I'll get on now and do the community detention."
The community detention includes a 9pm to 7am curfew each night.