Three men were arrested after separate seizures of heroin and cocaine in recent days.
In Limerick, a 36-year-old man was arrested on Friday following the search of a house in Moyross. Gardaí seized just over 2kgs of heroin and a small amount of cocaine with a combined street value of €500,000.
The man was arrested at the house. He was later released and a Garda spokesman said a file was being prepared for the DPP.
A second operation in Co Laois on Saturday resulted in the arrest of two men in their 20s.
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They were detained at Portlaoise Garda station after officers seized heroin with an estimated street value of €300,000.
One of the men has since been released.