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 site as part of a precautionary security measure. This coincided with several other retailers, including CVS and Walmart Canada, shutting down similar services regarding a security breach at PNI Digital Media. The UK Groceries Code Adjudicator found in a 2015–16 investigation into Tesco that some suppliers paid "large sums of money in exchange for category captaincy or participation in a price review". She found some evidence of benefits which suppliers derive from these arrangements, but also recorded a concern—to be investigated further—as to whether the purpose of the Groceries Code was being circumvented by these payments. Tesco Tesco plc, trading