2013 horse meat scandal around 500–600 burgers containing 100% horse meat would need to be eaten to receive the daily human therapeutic dose. Additional tests at that time indicated than none of the products from Findus contained phenylbutazone. Another report found that between two and five percent of samples tested between 2007 and 2011 had phenylbutazone contamination, and that only 50 samples per year were tested. In 2012, 145 carcasses had been tested, and two out of the nine carcasses found positive for bute that year were not reported to the FSA for seven months. In April 2013, the FSA reported it had not
Tesco of its products in response, and announced that they were working with authorities and the supplier to investigate the cause of the contamination. In July 2013 Tesco security staff violated the UK Equality Act 2010 by refusing to allow a blind lady's guide dog to enter the Feltham shop. Tesco staff refused to apologise for the violation of the law for 5 days. It was also revealed that security staff had thrice previously ordered a different blind person and his guide dog to leave the shop. Following further incident in 2013 when the manager of Tesco in Sutton ordered a