adjective

testimonial

Relating to evidence given by a witness.

The jury weighs testimonial evidence alongside photographs from the scene.

Etymology

The source names evidence given by a witness. Testimonial directly describes matters connected with that witness-based evidence.

More examples

The lawyer challenges the reliability of the testimonial evidence.
Her account provides testimonial support for the driver's version of events.
The report distinguishes testimonial evidence from physical evidence.

testimony noun — Evidence given by a witness, especially under oath.

evidentiary: Relates to evidence generally, not just statements made by witnesses.