The Food Standards Agency has dismissed claims that the horse drug 'bute' may have entered the human food chain in horsemeat.
The FSA said horses treated with the drug phenylbutazone are "not allowed to enter the food chain".
The FSA statement added: "During the recent horsemeat incident the Food Safety Authority of Ireland checked for the presence of phenylbutazone and the samples came back negative."
Shadow Environment Secretary Mary Creagh earlier expressed fears that the drug may have entered the food chain through horsemeat slaughtered in UK abattoirs
More top news
Thousands of shoes placed in Paris's Place de la Republique after climate change march cancelled in the wake of the terror attacks.
Tyson Fury is the new heavyweight champion of the world, so who will he face next?
World leaders are gathering in Paris for a UN climate change summit aimed at securing a global deal on limiting greenhouse gas emissions