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 the SFO, who took matter out of the hands of the Financial Conduct Authority, the City's business regulator. The UK accountancy regulator, the Financial Reporting Council, is also reported to be monitoring Tesco. Tesco's auditor PwC declined to comment. It found that they were overstated by £118m in the first half of this year, by £70m in the 2013-2014 financial year and by £75m before that. Warwick Business School's Prof Crawford Spence said: "Now that Tesco are being investigated for fraud by the SFO, the Financial Reporting Council have yet greater reason to start an investigation into the auditors' role