A data-sharing deal between DeepMind and London's Royal Free Hospital Trust was struck on an "inappropriate legal basis," a top UK government advisor has said. In April 2016, NewScientist revealed that the company had received 1.6 million patient records to develop an app called "Streams." While there are strict rules regarding patient data and confidentiality, common law states that consent is "implied" if the information is being used for "direct care." Google's AI division used this line of thinking to justify the deal, however Dame Fiona Caldicott, the UK's National Data Guardian, disagrees because the app was still in testing at the time. If the app was in development, that means it wasn't yet ready for medical use.