One fifth of meat samples taken across the UK in 2017 contained DNA from animals not on the labelling according to the BBC.
Out of 665 samples tested from 487 businesses in England, Wales and Northern Ireland by the Food Standards Agency (FSA), 145 were partly or wholly made up of unspecified meat.
The FSA said the levels were consistent with “deliberate inclusion” meaning the levels of unnamed DNA in the samples were greater than 1%. Below this level, contamination could be caused by poor hygiene. However, the agency did add that businesses with "compliance issues" had been targeted.
Out of the 145 contaminated samples, 73 came from retailers, 50 came from restaurants and 22 from processing plants. A spokesperson for the FSA said the results were "not representative of the wider food industry".
This new data comes five years after the horsemeat scandal in 2013, but none of the 2017 samples contained horsemeat.
The BBC also said some of the tests showed: