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In the broadest sense of the term, to prove something means to demonstrate or test its validity by evidence or argument. In this loose sense, scientific theories can be proven.. But normally scientists don't say a theory is proven, because they use that term to refer to the result of a logical deduction. In this rigorous sense, scientific theories can never be proven; they can only be confirmed. Only mathematical theorems can be proven.
A. Generally: Before evidence may be admitted, the proponent must show that it is authentic, i.e. that the evidence is what the proponent claims it is.