Revenue has seized around 1kg of herbal cannabis in County Laois.
The drugs, worth around €20,000, were uncovered after Gardaí and Revenue officers carried out searches at two properties in the Portlaoise area on Thursday.
Gardaí said three men, a 22 year-old Lithuanian man, a 23 year-old Irish man and a 20 year old Polish man, were arrested at the scene.
They were questioned at Portlaoise Garda Station and the investigation is ongoing.
Alcohol seized by Revenue at Dublin PortSeparately, Revenue seized alcohol with a retail value of €7,260 at Dublin Port on Thursday.
Revenue said the 500 litres of wine and 6 litres of spirits would have represented a potential loss to the Exchequer of €3,600.
They were found in two vehicles entering the country from France.