Britain's first mobile phone sniffer dog has been tested out at Norwich Prison.
Murphy, an English Springer Spaniel, has been specially trained to hunt out the mobile phone handsets - which have a particular scent.
Mobiles are a big security risk in prisons. They have been used to plot escapes, threaten court witnesses and organise crime on the outside.
About 500 have been found in jails in East Anglia in the past year.
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