Scots health board forced to deny surge in covid cases was down to tomato ketchup fooling tests NHS Grampian have issued a statement stating that no condiment is capable of tricking the tests NHS Grampian says all positive results from lateral flow devices are followed up with a PCR test (Image: Getty) Join thousands of others in getting the stories that matter to you sent straight to your inbox.Invalid EmailSomething went wrong, please try again later. Subscribe When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice.