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I don't think I am confusing these two things. And as far as I remember, concentrations of ppt (10^-12) is something that's possible to detect with state-of-the-art GS, HPLC, and MS devices. For many tests, what you actually need is ppb detection, which opens a few more options.

I completely agree with the time argument - such a machine was probably a decade or more away from being built.

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But that's not she wanted to sell 😚

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She wanted to sell a one-blood-drop-gives-all machine, as far as I remember.

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