Substantive evidence
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
that adduced for the purpose of proving a fact in issue, as opposed to evidence given for the purpose of discrediting a witness, (i. e., showing that he is unworthy of belief.) or or corroborating his testimony.
Best, Ev. 246, 773, 803. —-Substitutionary evidence.
Such as is admitted as a substifute for what would be the original or primary instrument of evidence; as where a witness is permitted to testify to the contents of a lost document. Defined under Evidence in Black's Law Dictionary.