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>the idea that you consent to any test by agreeing to drive sounds dubious.

This is the case everywhere in the US. The term 'implied consent' refers to the idea that a driver consents to chemical tests by virtue of operating an automobile on public roads.

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Hmm, I wonder if it's an unusual use of the word? reading online, many of the description say "an implicit agreement". I think the determinate would be: could you test the blood of an unconscious person?

>could you test the blood of an unconscious person?

If that person is unconscious and suspected of drunk driving, yes. The US Supreme Court ruled that the 4th doesn't prevent that search in Mitchell vs. Wisconsin.

However, if that person is conscious, implied consent does not allow officers to force a blood test without a warrant (Birchfield v. North Dakota).

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