Gardai raided a home and found €135,000 worth of drugs after seizing a small amount of cannabis from a car.
Just over €2,500 of cannabis was recovered from the vehicle after it was stopped and searched on Monday in the Green Road area of Mullingar, Co Westmeath.
The find led to a probe at a house in the Ashe Road area of the town - where officers discovered a large amount of suspected amphetamines.
A man, in his 30s, was arrested and detained at Mullingar Garda Station.
A spokeswoman said: "On Monday, 11th May 2020, Gardaí stopped and searched a car in the Green Road area of Mullingar, Co. Westmeath.

"During the course of the search, Gardaí recovered cannabis with an estimated value of €2600 (pending analysis).
"A follow-up search was carried out at a house in the Ashe Road area of Mullingar. Gardaí seized a large quantity of suspected Amphetamines with an estimated value of €135,000 (pending analysis).
"A man, aged in his 30s, has been arrested and is currently detained at Mullingar Garda Station under Section 4 of the Criminal Justice Act 1984. Investigations ongoing."