CRIMINALS now face having their ill-gotten gains sniffed out by specially-trained dogs.
The cash-smelling canines can detect large amounts of money - and when they do they sit down in front of the person carrying it.
The dogs are being used this week at Leeds Bradford Airport and also Leeds Railway Station.
It is part of a joint operation between the police and the North East Regional Asset Recovery Team and Customs and Excise.
The aptly-named dogs, Morse and Sherlock, are being used to sniff out people travelling with large amounts of concealed cash.
Nine people were stopped at the airport on Tuesday.
Police and customs officers recovered substantial amounts of cash in several currencies.
A 56-year-old South Yorkshire man is now being questioned by customs officers.
The dogs were at Leeds Railway Station on Wednesday.
The operations were part of a national campaign known as Payback, recently launched in London to confiscate assets gained through illegal activities.
Police and other agencies were given extra powers to conduct seizures under the Proceeds of Crime Act.
A large amount of the cash seized is then spent on tackling crime.
Det Chief Insp Dave Cooper, head of West Yorkshire Police Economic Crime Unit, said: "People who believe they can commit crime and enjoy living off the proceeds are sorely mistaken.
"Thanks to the Proceeds of Crime Act, criminals won't just face punishment through the justice system.
"Now we can hit them where it hurts - in their pockets."
Insp Andy Selby from the British Transport Police said: "We have information to suggest that large amounts of cash are being moved in and out of the region.
"Some of it is a result of illegal activity and some is intended to fuel further crime.
"While we are letting the public know about this operation, criminals should take this as a warning."
John Kinghorn, Customs Head of Detection for the North East, added: "We know criminals are attempting to ship their profits abroad to finance drug smuggling and other serious crime.
"We play a part in Payback by closing off this option."