The Food Standards Agency has said it will continue testing products "until there's nothing left to find" after the veterinary painkilling drug phenylbutazone - or bute - was found in Asda Smart Price Corned Beef.
The agency's director of operations Andrew Rhodes said customers should not eat the corned beef but added anyone who does is very unlikely to fall ill.
He advised customers to return the product to the supermarket to receive a full refund.
More top news
The Hollywood A-lister cried as she gave a candid answer to a young fan during a Q&A at Italy's Giffoni Film Festival.
The bank warned more than one million business customers it may introduce negative interest rates if the economy takes a tumble.
Amid tension between his supporters and Hillary Clinton's, Bernie Sanders called for unity to prevent Donald Trump becoming president.