Police have launched five prosecutions for the illegal sale of synthetic cannabis in the Western Bay of Plenty since the laws changed last year.
Information obtained by the Bay of Plenty Times under the Official Information Act showed there had been five prosecutions with one case still going through court.
Nationally there had been 157 prosecutions, with 61 cases progressing through the courts.
However, the number of active investigations was classed as operationally sensitive and was not provided by police.
Tommy Wilson, of Te Tuinga Whanau Support Services in Greerton, said the synthetic cannabis problem had shifted underground as soon as the new legislation came into force last year.