There are only two airports in Europe with United States border preclearance facility and one of them is Dublin Airport. The other one is Shannon Airport in Shannon, County Clare. Passengers traveling to the US can take care of their paperwork at these airports before their departure so they don’t have to do it once they arrive in the US.
Dublin Airport has dog units that can detect huge amounts of cash that may be used for money laundering. In 2011, the officials at the airport confiscated €37,000 that was found in the underwear of the passenger.