Holland's 'sniffer rats' have a nose for crime-fighting
13 September 2013 Last updated at 00:25 BST
Five "sniffer rats" have been in police training in the Dutch city of Rotterdam, learning how to distinguish between scents - including drugs and explosives.
The brown rats are due to go into active service next year, operating under the names Poirot, Magnum, Derrick - TV detectives popular in the Netherlands - and Jansen and Janssen, the Dutch names for the bowler-hatted detectives in Tintin.
It means the Netherlands will be the first country to use trained rats in civilian police investigations.
Anna Holligan reports.