A police officer was unjustified in using a Taser on a prisoner, the Independent Police Conduct Authority has found.
Police said the prisoner was "abusive and threatening" while being moved at the Hamilton District Court on January 26 this year.
One police officer became so concerned that he drew his Taser but kept it hidden from the prisoner.
A struggle ensued when the prisoner was being escorted down the stairs, which ended with the officer using the Taser on the prisoner's upper thigh, quickly followed by a second contact stun.
Camera footage from the Taser shows the prisoner was not kicking out or in a position to assault the officers when he was Tasered.