5 Min Read (Reuters) - At one of the world’s busiest airports, immigration officials are uncovering fake COVID-19 test results daily by checking the required documentation for misplaced letters and errant vowels. FILE PHOTO: A public health campaign message is displayed on an arrivals information board at Heathrow Airport, following the outbreak of the coronavirus disease (COVID-19), London, Britain, July 29, 2020. REUTERS/Toby Melville “Normally the way this type of counterfeit is spotted is an obvious spelling error,” said Lucy Moreton, an official with the Immigration Services Union (ISU), which represents border officials at London’s Heathrow Airport. With global vaccination programs still in early stages, a “negative” COVID-19 test from a local lab is now often necessary for plane travel around the world. But there is no standard form, language or encryption technology for such a certificate.