Illegal luggage searches could have been conducted by border officials at one of Britain's busiest airports, without the passengers' knowledge.
Over 1,000 pieces of luggage were seized at Birmingham Airport in the year to September.
However, Chief Inspector of Borders and Immigration John Vine said there was no record of the instances in which these searches did not result in a successful seizure.
Because of this, there is no way of knowing the total number of searches conducted in the period, and whether border staff were breaching passengers' rights.
More top news
Rescuing a cat from a tree may seem like a mundane task for California firefighters but not when the cat is a very large mountain lion.
Labour MPs are making a statement 'relating to the future of British politics'.
Could the longest rumoured split in a major British political party since the creation of the SDP almost 40 years ago happen on Monday?