The percentage of Northland court cases ending up with convictions is higher than at any time in the last 35 years.
Statistics New Zealand figures reveal more than 88 per cent of adults prosecuted in Northland courts in 2015 were convicted, the highest percentage since data became available in 1980. This figure has increased in five of the last six years.
Whangarei lawyer Wayne McKean said more people decided to plead guilty and that had contributed to the rise.
He said changes to the payment system for legal aid lawyers may also provide a financial incentive to avoid trials.
"You've got defendants represented by lawyers who are unlikely to get paid adequately if they take the case to trial," Mr McKean said. "What it means is, people are pleading guilty to offences that they otherwise wouldn't plead guilty to."