The searches were carried out at properties in Castlebar, Ballina, and Westport.
Last Sunday, a house in Castlebar was searched and €1,900 of cannabis herb was discovered.
On Bank Holiday Monday, officers swooped on a house in Ballina where cannabis plants, cannabis herb, and a small quantity of cocaine were found. The drugs had an estimated street value of more than €13,000. A man in his 40s was arrested. He was later released without charge and a file is being prepared for the Director of Public Prosecutions (DPP) on the matter.
On Tuesday, searches were carried out at two properties in a rural part of Castlebar. In one home, €500 worth of cannabis herb was seized and in the second house, €300 worth of cannabis herb was recovered. Two males in their 40s and 50s are assisting gardaí following the finds.
A house, located outside of Westport, was searched on the same day and €500 of cannabis herb was found.