How does a machine...

[Kurt Buff]

It doesn't. Do some investigation on forensics, and you'll find the obvious
thing: People testify that they are expert at understanding how the machine
in question operates, and are qualified understand the machine's output, and
to interpret the results, summarizing them for the jury.

Happens regularly in court.

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| give an oath to tell the truth and nothing but the truth?
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|  --
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| ____________________________________________________________________
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|             Whereof one cannot speak, thereof one must be silent.
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|                                       Ludwig Wittgenstein

Looks like you haven't learned this lesson yet...