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What about arrhythmias? Ectopic beats? Pacemakers? There are a surprising number of people with cardiomyopathies... can they really be accommodated unfailingly by this idea? Cardiologists routinely use drugs that will affect their patients' ECGs (sorry, I'm a Brit - I realise that the US abbreviation for electrocardiogram is EKG but I can't bring myself to use it). Maybe even something as common as beta-blockers would be enough to cause problems. Fingerprints and retinal scans would seem to be much more stable.