Why is it that an object (or life form) that doesn't exist, can't possibly (never, ever), be proven to not exist?

Please provide the "official" ..... technical, peer reviewed, conclusive,scientific specifications that show this to be the case.

Please DON'T provide your opinion, or your hatred towards others. I'm NOT interested in your 'opinions'.
Update: NOTE: If you provide your mere "opinion" your answer will be DISQUALIFIED.
Update 2: Donald --- YOUR ANSWER IS DISQUALIFIED.
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