Why haven't scientists developed an electronic device that can be embedded in the human body to record the exact date and time of death?

Why would they want to waste money on such a device?

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There was a man who was beaten to death and they were able to use the data from his pacemaker to find out the time it happened.

Because there is no interest in using such a device.

No need

Mainly because death is not always certain.

Don't wish too hard for such a device,

because you can bet your life (!) that if it was ever developed,

it would include a feature that would allow an outside agent

(government) to kill you without warning.

You dreamers keep Amazing me with your Lack of Follow-Through...

$.

When there is real money to be made from knowing that information - to fund the development, production, installation and maintenance of such a sensor - then it may happen. In the meantime, existing methods are adequate and much less expensive to use.

How can it do that?

There's no exact point where a person dies -- the person can be dead and still have growth of new cells. The brain can keep thinking for at least minutes after the heart stops. The heart can continue beating even when the brain has stopped functioning.....

A pacemaker does that.

There was a man who was beaten to death and they were able to use the data from his pacemaker to find out the time it happened.