The director of the Mental Health Unit and head psychiatrist, Mapa Puloka, made the comments at a recent workshop.
Dr Puloka said most of those who came to the hospital for help were put into the Mental Health Ward, but staff said ineffective services meant many were not properly cared for.
There were almost weekly arrests of drug dealers, especially for methamphetamine or marijuana offences, and among them are senior Customs officials, who have been instrumental in "clearing" container shipments of drugs coming into Tonga from overseas, Dr Puloka said.
