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 Mobile was taken over by Vodafone. On O December 2009, Tesco Stores SR announced that it would enter into a joint venture with Telefónica Slovakia to offer mobile telecommunications services. The service, which is Slovakia's second MVNO (the naymobile having been the first), uses the O network but operates separately. In May 2013, Tesco Stores ČR a.s. announced that it would enter into a joint venture with Telefónica Czech Republic to offer mobile telecommunications services. The service, uses the network O, but operates separately. Tesco Mobile Tesco Mobile Limited (trading as Tesco Mobile) is a mobile virtual network operator (MVNO) in