Quintilian, and J.S. Watson. Institutes of Oratory.Edited by Lee Honeycutt, 2010. Kindle Electronic Edition. Book V Chapter 4.
Having discussed evidence from public report, Quintilian turns in 5.4 to evidence gained by torture. Some affirm torture as a means of gaining truth while some as a means of gaining falsehood (Quintilian V.4.1). The reality is that the method of gathering and evaluating the testimony matters a great deal. If the testimony is valid it should be used.