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
Criticism of Tesco but Tesco backed down. Tesco has been subject to several claims of apparently out-of-date food being 'back-labelled' to appear still to be within date, poor café hygiene and a staff member contracting legionnaires' disease in the Wrexham store. Tesco denied squeezing its suppliers in December 2013 after retail analyst Cantor Fitzgerald accused Tesco of practices that risked breaching the Groceries Supply Code of Practice and criticized its trading relationships. Similar accusation were also made in April 2005 despite its record £2 billion profit. In May 2004, Tesco announced it was reducing sick pay in an attempt to reduce levels of