The use of sniffer dogs at Manchester Airport has been criticised after dogs there failed to discover any Class A drugs in a seven-month period.
But one dog, trained to detect illegal animal products, often found “small amounts of cheese or sausages” carried by holidaymakers, a report said.
The review, by the Independent Chief Inspector of Borders and Immigration, assessed border checks at the airport.
The Home Office, which oversees border checks, said improvements must be made.
Some recommendations had already been implemented, it added.
The report examined how “efficiently and effectively” Border Force – which is managed by the Home Office – operated at Manchester Airport.