More than a fifth of meat sample tests in 2017 found DNA from animals not on the labelling, the BBC has learned.
Out of 665 results from England, Wales and Northern Ireland collected by the Food Standards Agency, 145 were partly or wholly made up of unspecified meat.
The FSA said the levels were consistent with "deliberate inclusion" – but added testing had targeted those businesses suspected of "compliance issues".
The samples came from 487 businesses, including restaurants and supermarkets.
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