2013 horse meat scandal negative for horse DNA. products were tested but were negative for all foreign DNA. Of the 37% of beef products tested positive for horse DNA, Tesco's inexpensive Everyday Value Beef Burgers tested at 29.1%. All other reported brands had less than 0.3% horse DNA. These products originated from Liffey Meats and Silvercrest Foods in Ireland and Dalepak Hambleton food processing plant in the United Kingdom. Trace amounts of horse DNA were also found in raw ingredients imported from Spain and the Netherlands. Laboratory DNA investigations were requested by the authorities into possible donkey meat adulteration of minced meat products labelled
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