Police have been criticised for using unjustified use of force when they double-tasered a Greymouth man in 2015.
Findings released by the Independent Police Conduct Authority (IPCA) say the officers involved in the incident were wrong to use a taser after the man was refusing their instructions and resisting arrest.
The incident happened in June 2015 when a sergeant ordered a constable to stun the man once, to no effect, before ordering him to tasering the victim a second time in order to get him into a police van.
The IPCA concluded the sergeant should not have instruct the constable to use the taser, which delivers a 50,000 volt shock.
Tasman district commander Steve Kehoe says they agree with the IPCA's findings.
"In this instance [the use of a taser] was unjustified and the sergeant should not have directed an inexperienced officer to contact stun the man because he was not being assaultive," he says.
"We understand the pressure felt by the constable to follow their supervisor's orders and have provided advice around this matter to them.
"There have been a number of lessons learned from this incident and we acknowledge the mistakes that have been made and have reviewed some procedures as a result."
The sergeant in involved in the incident has since resigned from the police force.