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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.
Scientists in Israel have demonstrated that it is possible to fabricate DNA evidence, undermining the credibility of what has been considered the gold standard of proof in criminal cases. The scientists fabricated blood and saliva samples containing DNA from a person other than the donor of the blood and saliva.They also showed that if they had access to a DNA profile in a database, they could construct a sample of DNA to match that profile without obtaining any tissue from that person.ucleixâs test to tell if a sample has been fabricated relies on the fact that amplified DNA â which would be used in either deception â is not methylated, meaning it lacks certain molecules that are attached to the DNA at specific points, usually to inactivate genes.