This is evidence that does not forget. It is not confused by the excitement of the moment. It is not absent because human witnesses are. It is factual evidence. Physical evidence cannot be wrong; it cannot perjure itself; it cannot be wholly absent. Only its interpretation can err.
Oath definition, a solemn appeal to a deity, or to some revered person or thing, to witness one's determination to speak the truth, to keep a promise, etc.: to testify upon oath. See more. Dictionary.com
swore. 1  1 : to use bad or vulgar language : curse. 2  2 : to make a statement or promise with sincerity or under oath : vow I swear to tell the truth. 3  3 : to give an oath to The witness was sworn. 4  4 : to bind by an oath He swore them to secrecy. 5  5 : to be or feel certain I swear I saw it a minute ago.