In a bid to allay consumer fears about food safety, Sainsbury's has become the first UK supermarket chain to test all its beef products for evidence of BSE contamination. The retailer revealed that the EU validated test analyses samples of recently slaughtered cattle for the presence of the abnormal prion protein that indicates BSE. The test was developed by Swiss scientists and will be introduced in suppliers' slaughterhouses, with a long term view of testing every piece of beef on Sainsbury's shelves.