It said a concerning aspect of the offending was that Thomson was employed as a police prosecutor at the time, he said.
He had also posted videos of his drug use on a website.
While Thomson had fully cooperated with all investigations and admitted guilt at the earliest possible opportunity, no penalty short of striking off would properly reflect the seriousness or protect the public, in the absence of reliable material to suggest another rehabilitative course, Mr Moore said.
"Lawyers must appreciate that they are required to maintain high standards of behaviour in their personal lives as well as professionally.
"Anyone who fails in this lets down the whole legal profession."
Thomson was a prosecutor based at Auckland central police station at the time of the offending. A police spokesman said Thomson resigned from the force at the end of January.