In absolute terms, yes. But GPs and all healthcare staff are bound by data protection laws. However, owning a smartphone, going on the internet, driving a car with a sat-nav, having a bank account and many other aspects of modern life potentially compromise security, because you leave an electronic record of your activities and locations. Other than living ‘off-grid’, there is no way of avoiding this.
In his latest OffBeat blog, Bill Harriman discusses the reasoning behind BASC's support of medical markers for certificate holders.