James Danny (48), from Solang village, Lou Island, was found guilty for being in possession of dangerous drugs and cultivating dangerous drugs.
Police conducted the raid on November 16 and uprooted marijuana plants in a garden. They also confiscated some drugs in his house.
He now remains in custody at Lorengau, awaiting his sentence.
Manus Provincial Police Commander, Chief Inspector David Yapu, said Danny was a threat to the community due to his involvement in drug activities in the community.