Investigations have been continuing today to try and find out why a racehorse owned by the Queen and trained by Sir Michael Stoute in Newmarket tested positive for a banned substance.
In a statement the Queen's racing manager said it's thought Gold Cup winner Estimate failed a drugs test because some of her feed was contaminated.
Four more horses from different yards also failed the test.
Click below to watch a report from ITV News Anglia's Tanya Mercer
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