This week on Customs, the specially-trained Customs dogs step into the limelight. Drugs or large amounts of cash can't escape these canine experts - they check out passengers waiting for planes, buses crossing from the Republic to the North, baggage on carousels at the airports, and sacks full of packages at the mail sorting centre.

Dog handler Andrea Leamy and her springer spaniel Thatcher are on border duty at Dundalk Bus Station. Thatcher detects a suspicious bag on board the bus, and afterwards finds a lump of cannabis nearby, possibly discarded by one of the passengers.

Cash dog, Storm, is on duty at Dublin Airport and sniffs out €10,000 in a passenger's bag. It's illegal to take this amount of money outside the European Union without making a declaration. The passenger says he wants to buy equipment abroad, and after completing the paperwork he is allowed to continue his journey.

At the An Post distribution centre in Dublin, the legendary canine senses come up trumps again when two different consignments of cannabis are detected inside sealed packages.