Not so fast there....
even if you give margins of error, this technology is very precise now that we have sensors capable of making such accurate measurements at good prices. The way your heart beats and your blood volume is very unique if you treat the data properly, normalize it, continue to sample etc. you can build up a very strong biometric view of the owner, sufficient to tell if you have had a coffee, get pregnant, had a drink, run a mile etc. just two or three beats can pick you from say 1500 people, and six or more could pick you uniquely from the US population. I've worked on this before. at Palm, but they didnt see the light....
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The poster you replied to has a big point. EKGs/ECGs are not constant. I doubt to a very high extent that you can couple an EKG to a person, unlike iris scans, vein scans and fingerprints. Also, the EKG will vary depending on how you grip the sensors on the phone, and even depending on which hand you use.
So, I'm actually confused about what Apple's doing here.
If a valid user gets an arrythmia, what is the phone going to do?[/QUOTE]