2013 horse meat scandal only found more than 1% horse DNA in Asda's tins of but it also contained four ppb of phenylbutazone, marking the first time since the start of the scandal that bute had been detected in a meat product in the UK food chain. However, one problem raised was over documentation; all of the UK animals with phenylbutazone contamination tested in early 2013 possessed a "horse passport" that allowed the carcasses to be sold for human consumption. The veterinary residues committee (VRC) reminded the public in July 2012 that it had been "repeatedly expressing concern" about phenylbutazone contamination. and recent discoveries
Tesco Ireland in October 2011. In January 2012, a Tesco employee, who was dismissed after contracting the HIV virus, was awarded damages at the Employment Appeals Tribunal. In June 2012, Eurostat blamed "overly dominant supermarkets" as a factor why Ireland is the fifth dearest nation in the EU. Tesco is the market leader with 28% share of the grocery market. In February 2013 it was reported that staff at a Tesco warehouse were made to wear digital arm-band devices that monitor their performance. Tesco was branded "hypocritical" by Irish poultry farmers for its commitment to source all UK-sold fresh poultry from the