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I don't follow the logic here.

Who is going to use this? If they drive a Big White Truck, an ordinary capnograph won't make it any bigger. Otherwise, they're not even trained to check for a pulse, because history shows they'll stuff it up in real life. (Real life refers to the first aider - it's most likely real death for the patient, no matter who treats them.)

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We don't want first-responders to have to open up the patient to know if the patient is dead or just mostly dead, and moving the patient into an emergency medical vehicle may not be the best first move. This would be particularly true for field medics in combat situations.

Ideally, a portable/cheap capnograph would be one part of a 21st century first-aid scenario, while the other parts might include automatic defibrillators and freezing blankets.

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