From the WSJ article:
Some people list emergency contacts on an implanted tag. And others see potential for the use of the tags in medicine, though one big challenge needs to be addressed for those visions to become reality: Medical personnel or anyone else trying to help someone in a medical or emergency situation will need to have some way to know that the person they’re trying to help has potentially lifesaving information available under his or her skin.
For instance, Kevin Warwick, deputy vice chancellor at Coventry University in England and an expert in cybernetics, says that people who suffer from epilepsy often wear pendants that identify them as having epilepsy and sometimes provide emergency contacts and some basic information on how to help a person having a seizure. But the pendant can be lost or forgotten—a tag cannot. Paramedics and other first responders could be trained to check for tags, he says, and perhaps people with epilepsy could have a small tattoo or some other marker to help other people find the tag.
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