'Bill', a Customs & Excise dog, sniffed out €77,000 cash during a Louth Road Policing Unit-led Multi-Agency checkpoint on the M1 motorway today.
Gardaí and Bill assisted in a search of the van, and cash was seized during the search.
According to gardai, the driver was arrested and detained at Dundalk Garda station.
In a Twitter update, gardai were on point with their pun: "Bill finds the bills."
Investigations are ongoing.