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Human have the ability to lie and it is impossible to tell if someone is lying or not without other evidences
Human memory is often unreliable and easily persuaded or edited by outside factors that could contradict proof.
The validity of someones word is not possible to guarantee, and is one of the fundamental flaws of modern law.
Nothing can be considered "proof" of anything, just evidence of varying strength.
This conclusion creates the opportunity for anyone to do anything they want to anyone else without repercussion, as long as the perpetrator is not recorded in the process.
It can though be complementary to evidence.
You have to give someone's word a certain amount of trust, otherwise the world wouldn't function as it does