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 with regard to these irregularities". The accountancy firm Deloitte had launched investigation into Tesco's misreported profits a week earlier. Tesco had suspended eight executives pending further enquiries by 18 October 2013, including the UK corporate boss Chris Bush, while an investigation into the scandal takes place. The firm is also withholding payments worth £2,000,000 to its former chief executive Philip Clarke and chief financial officer Laurie McIlwee. In 2007 Tesco failed to deliver groceries via online shopping to a university campus in Sussex, offering no refund or apology. This sparked a local backlash from many customers who had similar dissatisfying